32results about How to "Reduce error interference" patented technology

The invention discloses an aneuploidy biological information analysis method and system, wherein the method comprises: 1) constructing a reference database; 2) calculating UR ratio; 3) constructing statistical parameters of the reference database; 4) calculating Z value; 5) decreasing fetal chromosomal aneuploidy false positives due to microdeletion or micro-duplication present in maternal chromosomes according to the above process of decreasing fetal chromosomal aneuploidy false positives due to microdeletion or micro-duplication present in maternal chromosomes; 6) constructing a fetal DNA concentration prediction model to predict fetal DNA concentration according to the above process of constructing a fetal DNA concentration prediction model; 7) calculating percentage of DNA of each fetal chromosome to total DNA; 8) judging autosomal aneuploidy; 9) judging allosomal anomalies. By using the method and system according to the technical scheme, analytical accuracy is improved greatly.

The invention discloses a six-degree of freedom vibration absolute measuring method based on a triaxial acceleration sensor array, which comprises the following steps of: establishing a sensor array comprising four capacitive triaxial acceleration sensors, directly measuring the three-dimensional acceleration of a measured object at different positions in different directions, and then calculating the three-dimensional linear velocity of the measured object. In the invention, the coordinate of the ground is regarded as a reference, and the sensors are not in direct connection with the reference body, so that the measurement is an absolute measurement; a six-dimensional vibration parameter is obtained by calculating the measured vibration acceleration of a moving body so as to realize a six-degree of freedom compound vibration absolute measurement; and the method has the characteristics of low cost, large dynamic range, fast response, long service life and high reliability. The method disclosed by the invention is suitable for the six-degree of freedom vibration absolute measurement of moving bodies, such as vehicles, ships, airplanes, and the like, which have very complex vibrations in six directions of degree of freedom.

The invention discloses a gamma emitter position distinguishing system and method. The system is mainly characterized by comprising a reconnaissance plane and a test site; the reconnaissance plane comprises a data acquisition module, a signal processing module and a signal coupling output module; the test site comprises a signal demodulation receiving module and a data processing module; the data acquisition module is composed of a gamma ray detector and a GPS (global positioning system) module; the signal processing module is composed of a gain adjustment module, an analog filtering module and a data preprocessing module; the data processing module is composed of a data analysis and judgment module and a 3D (three-dimensional) dynamic simulation module. By the system and method, position detection of a gamma emitter can be realized quickly, and detection efficiency and detection accuracy are improved.

The invention provides a method for detecting the three-dimensional texture morphology of an asphalt pavement. According to the method, the macroscopic texture morphology and the microcosmic texture morphology of the pavement can be obtained at the same time. On the basis of a traditional photometric stereo three-dimensional reconstruction technology, six illumination light sources are added, and a low-rank decomposition correction algorithm and a global integration algorithm are adopted to improve a two-step algorithm of normal vector solving and three-dimensional reconstruction, so that error interference is reduced, and test precision is improved. Six light sources are required to respectively and independently irradiate a test surface from six directions of a zenith angle of 45 degrees, an oblique angle of 0 degree, 60 degrees, 120 degrees, 180 degrees, 240 degrees and 300 degrees, and cameras fixed right above the test surface are adopted to respectively collect six road surface images under different illumination conditions. Compared with a traditional road surface texture morphology testing method, the method can remarkably improve the testing precision of the road surface texture morphology, and has the advantages of being rapid, accurate, high in repeatability and the like.

The present invention discloses a conjugate gradient attitude solving method for abnormal gait recognition. The method comprises the following steps: processing data of an accelerometer and a magnetometer by using a conjugate gradient method to obtain a solution attitude angle, and then fusing the solution attitude angle with an attitude angle of a gyroscope obtained by numerical integration to obtain a final attitude angle. According to the method provided by the present invention, by using the complementary characteristics of the gyroscope, and the magnetometer and accelerometer in the frequency domain, through a complementary filter, the solution attitude angle of the magnetometer and accelerometer is fused with the attitude angle of a gyroscope obtained by numerical integration to obtain a final attitude angle, so that the precision of the attitude measurement can be improved, the error of the gyroscope attitude is reduced, and the dynamic performance of the accelerometer is improved.

The invention relates to a stay wire type three-dimensional space positioning device, which comprises a mounting seat, stay wire sensors are arranged on the mounting seat, each stay wire sensor is provided with a stay wire, the free end of each stay wire is provided with a pull head, and the pull heads are used for being fixed at different known coordinate point positions; concentrated reversing pulleys corresponding to the stay wire sensors are respectively arranged on the mounting seat; a pull head of each stay wire is led in through a wire inlet side of the corresponding concentrated reversing pulley, bypasses the corresponding concentrated reversing pulley and then is led out from a corresponding wire outlet side; and a set center point is arranged on the mounting base, the centralized reversing pulleys are distributed around the set center point and are arranged close to the set center point, and the wire outlet side of each centralized reversing pulley is located on the side, facing the set center point, of the centralized reversing pulley. When the to-be-measured target object moves and the connecting position of the pull head needs to be changed, the pull head of the pull wire is directly detached and connected to the position of the known coordinate point which is determined again, only the pull head of the pull wire is operated during operation, the integration degree is high, and use is convenient.

The utility model discloses a trace gas concentration detection device, solves the problem that the existing trace gas concentration signal extraction is not accurate enough, and belongs to the field of weak signal detection. According to the invention, an arbitrary waveform generation module is constructed by using an FPGA internal digital circuit, and reference signals required by a digital signal processing module and driving signals required by a laser driving source are generated by the arbitrary waveform generation module. The frequency of an input signal which is sent into the digital signal processing module and contains trace gas information is ensured to be consistent with the frequency of a reference signal to the greatest extent, and accurate gas concentration information is obtained. A dual-channel phase frequency lock-in amplifier constructed by a digital signal processing module in an FPGA is used for respectively squaring two paths of difference frequency signals with phase information generated by dual channels through a multiplier, the two paths of signals are added, and amplitude information with a phase error of 0 is obtained through root extraction; and the influence caused by the phase error of the detected signal and the reference signal is avoided.

The invention discloses an optical chip module testing device which comprises an upper module and a lower module which are matched. The upper module comprises a test probe, the lower module comprisesa chip placing base, a chip placing groove is formed in the chip placing base, an installation space which is opposite to the chip placing groove and is communicated with the groove bottom of the chipplacing groove is formed in the chip placing base, and an LENS is arranged in the installation space in a translational mode. According to the scheme, the installation space corresponding to the chipplacing groove is formed in the chip placing base, and the LENS with the adjustable position is arranged in the installation space so that the horizontal position of the LENS can be flexibly adjustedaccording to test requirements, the centering precision of the center of the lens and the optical center of the chip is ensured to be within 0.01 mm, the error interference can be reduced and the precision of the test result can be improved.

The embodiment of the invention discloses a flow calculation device and a flow calculation method. The flow calculation device comprises a signal transmitting and receiving module, a transduction module and a control module; the signal transmitting and receiving module is electrically connected with the control module; the signal transmitting and receiving module comprises a signal transmitting end and a signal receiving end; the control module is used for controlling the transduction module to be connected with the signal receiving end and controlling the transduction module to be disconnected with the signal transmitting end so as to measure noise information of a to-be-measured medium and obtain noise components; the control module is further used for controlling the transduction module to be conducted with the signal transmitting end and the signal receiving end at the same time so as to measure flow information of the to-be-measured medium and obtain a measured flow value, and determining a real flow value of the to-be-measured medium according to the noise components and the measured flow value. Therefore, the real flow value of the to-be-measured medium can be obtained by completely removing the noise components when the real flow value is calculated, error interference generated by the noise components in a detection environment is reduced, and the flow calculation precision of the to-be-measured medium is improved.

The invention discloses an in-vitro double dynamic degradation performance analysis device for a medical magnesium alloy implant material. A base is provided with a computer, an electrochemical workstation, a motor, a sample tank, a speed regulating peristaltic pump and a thermostatic bath. The motor drives a crank mechanism through a belt, a pinion and a large gear. The tail end of the crank mechanism is fixedly connected with the upper end of a swing rod, the lower end of the swing rod is provided with a sample, and the swing rod is inserted into a sample groove. The sample groove, the speedregulating peristaltic pump and a liquid storage tank in the thermostatic bath are in communication with each other to form a circulation flow channel. The sample tank is provided with a first thermometer, a pH meter and a flowmeter, and the liquid storage tank is provided with a second thermometer. The data output ends of the first thermometer, the pH meter, the flowmeter and the second thermometer are connected with the computer, and the control signal input ends of the motor, the speed regulating peristaltic pump and the thermostatic bath are connected with the computer. The electrochemical workstation is connected with electrodes in the sample tank to connect with samples, and the electrochemical workstation is in bidirectional data connection with the computer.

The invention discloses a pressure drop flow testing system and method for testing a pipeline flame arrester, and belongs to the technical field of flame arrester performance testing; the pressure drop flow testing system comprises an air supply device, a pressure control device, a pressure drop flow testing device and a controller, wherein the air supply device, the pressure control device and the pressure drop flow testing device are connected in sequence. According to the invention, the pressure drop flow test in the mass standard is realized, the stability is kept at different pressure drop numerical points, the pressure drop parameters can be manually adjusted through the controller; meanwhile, the corresponding flow is read, and the measurement error is reduced.