99 results about "Filter test" patented technology

The invention discloses a graded positioning method for agricultural machinery navigation, comprising the following steps of acquiring a first positioning parameter, utilizing a Kalman filter to fuse the first positioning parameter, acquiring a second positioning parameter, acquiring a third positioning parameter, utilizing multi-sensor self-adaptive weighted fusion algorithm to fuse the second positioning parameter with the third positioning parameter, acquiring a target positioning parameter and positioning agricultural machinery according to the target positioning parameter. The invention also discloses a graded positioning system for agricultural machinery navigation. By fusing the positioning parameters acquired by measurement equipment for a plurality of times, the graded positioning method can smooth DGPS positioning data, effectively avoid the abnormal results of DGPS dynamic positioning, effectively filter test noise, reduce systematic error, form continuous, stable and accurate the information of the positions and course heading angles of agricultural machinery, and improve the positioning accuracy of agricultural machinery navigation.

An automated system for concentrating potentially harmful substances from various water types or other non-viscous liquids to facilitate detection of those substances is disclosed herein. The automated system comprises a water pressure driven or pump driven concentration unit that filters the test fluid through a hollow-fiber filter. Material collected on the filter is backflushed into a collection vessel by passing a small volume of sterile solution through the filter in the reverse direction. The automated system can be configured to be portable or to be integrated into a continuous liquid stream for online monitoring of test fluids. Optionally, an electronic signal at the end of the backflush sequence triggers a detector, such as an automated array biosensor, to begin processing and analyzing the sample.

The description describes a test sample preparation device comprising a housing, a filter assembly disposed over an opening in the housing and including a plurality of wells, a sampler tray removably disposed in the housing, and a plurality of vials removably coupled to the sampler tray and being in liquid receiving relationship with the wells. A filter assembly is also disclosed and which comprises a cover defining an impervious wall and plurality of wells formed in the wall, each wall having first and second open ends, the second open end of the well comprising a tubular protrusion. A housing is also disclosed and comprises a generally cylindrical body, a vacuum channel providing fluid communication between the interior and the exterior of the cylindrical body, and a key mechanism including a post having first and second ends, the key mechanism being arranged to orient a sampler tray and vials with respect to the housing. A method for simultaneously preparing multiple test samples for automated liquid chromatography and a method for automated liquid chromatography are also disclosed and comprise depositing test samples into a plurality of wells, simultaneously passing the test samples through porous media disposed in the wells, and depositing the filter test samples directly into vials removably coupled to a sampler tray.

A method for testing stability of a server includes the following steps. Providing a first user input interface for a user to input test parameters. Generating a control signal according to the input test parameters and transmitting the control signal to the BMC of the server. Controlling the server to start and shut down via the BMC. Detecting whether the tested characteristics are within specified ranges during each start and shutting down operation. Generating a SEL if any abnormal result is obtained and records a test time when the abnormal result is obtained in the SEL. Storing the generated SEL in a storage unit. Providing a second user input interface on the display for the user to input conditions to filter test results. And responding to the input conditions and outputting corresponding test results to the display.

This invention relates to one parallel source filter and its mixture compensation system control method, wherein, when the filter testes load current, the filter tests the electrical network voltage and load current resonance component; the test load current is to control source power filter needed resonance wave; the test network voltage controls the source power filter into one resonance resistance with resonance wave value as set.

The invention discloses a page service A / B testing method and device and relates to the technical field of computers. The method comprises the steps of receiving a page request sent by a client; filtering test elements in an initial template according to the page request and preset rules, and obtaining a test template; generating a test page according to the test template; and sending the test page as the response to the page request to the client. Technical problems that the existing A / B testing process consumes time and is not flexible and easily leads to rise of error rate and risk increase are solved. The page service A / B testing method and device have the advantages that modification operation is reduced, time consumed for operation is reduced, and testing flexibility and accuracy rate are improved.

A frequency-modulated continuous-wave (FMCW) radar system for level or distance measurement in which a frequency modulated signal to be transmitted to a target is mixed with an echo signal from the target to produce a beat signal that passes through an analog filter before being digitized and processed in a digital processor to determine the level or distance to be measured, where a test signal is generated by a signal generator, and a switch is controlled to connect the beat signal or the test signal to the analog filter, the signal generator generates the test signal as a broadband signal having a periodic waveform, e.g., a square wave, and the digital processor calculates a spectrum of the digitized filtered test signal by Fast Fourier Transform and generates a fault signal if the spectrum differs from a reference spectrum by a predetermined amount to allow for failure detection.

The invention discloses a test question intelligent pushing method and system. The method comprises the following steps: collecting and input examination questions; adding an attribute label to the examination questions; determining user attribute information, and obtaining user attribute information by adding labels to the user based on the examination, homework, and exercise behaviors of the users; searching for the test questions corresponding to the knowledge points according to the search conditions determined by the user or the knowledge points to be searched for according to the examination or homework performed by the user, and searching for the test questions corresponding to the knowledge points to be searched for from the test questions database; screening the found test questions, screening out the corresponding test questions of the core knowledge points, and the test questions matching the attribute label and the user attribute information; pushing the filtered test questions to the client used by the user. The invention carries out attribute labeling on users and sorts out knowledge points corresponding to wrong questions, so that the pushed test questions can be suitable for different users.

The invention discloses an EMI filter loading insertion loss automatic test system. The system is characterized in that an upper computer and lower computer structure is adopted, and an upper computer, a signal generator, a data collecting card, a filter test box and a lower computer are included. The system is used for improving efficiency, accuracy and the test speed in filter parameter detection, labor intensity is relieved, test time is saved, a certain intelligent test data analysis and processing function is provided, feedback information of power filter design data is obtained, a filter installation application instruction is provided according to filter performance parameter test data and analysis results, and accordingly a filter can perform the anti-interference performance to the largest extent.

The invention discloses an LTCC filter testing board, and the testing board comprises a substrate, a first grounding layer, a second grounding layer, a third grounding layer, and a signal transmission layer. The first grounding layer is disposed on a first surface of the substrate, and the second and third grounding layers and the signal transmission layer are disposed on a second surface of the substrate in a mutually insulated manner, thereby forming a coplanar waveguide structure. The second and third grounding layers are respectively in electrical connection with the first grounding layer through a grounding layer connection hole. Two ends of each of the second and third grounding layers are respectively connected with a negative input end and a negative output end. Two ends of the signal transmission layer are respectively provided with a signal input end and a signal output end. Parts, located at centers of the signal input and output ends, of the signal transmission layer are provided with binding pads. The bonding pads are electrically connected with a to-be-measured LTCC filter. The testing error of the testing board is small, and the testing frequency range is larger. The invention also relates to an LTCC filter testing clamping tool.

The invention relates to a CAN (Controller Area Network) bus controller test method, belongs to the technical field of electronic component detection, and solves the problem of lack of comprehensive CAN bus controller test in the prior art. The method comprises the following steps: obtaining a current test mode and entering a corresponding working mode, wherein the current test mode is a message sending test mode, a message receiving test mode, a sleep test mode, a filtering test mode and an arbitration failure test mode; and constructing a CAN bus environment corresponding to the working modethrough an RX end of the CAN bus controller, and testing the CAN bus controller in the corresponding working mode in the CAN bus environment corresponding to the working mode. According to the method, the RX end of the CAN bus controller is fully utilized to create a CAN real working environment for the chip so as to complete testing of corresponding functions of the chip.

The embodiment of the invention provides a method and a device for radio frequency consistency test of a wireless communication terminal of a public network. The method mainly comprises the following steps of according to the requirements of a test specification for the radio frequency test of the wireless communication terminal, selecting a function link from a function link group by a coaxial switch to engage, and selecting a filter from a filter group by a coaxial switch to engage; and enabling the function link group to receive the inputted tested signal of the wireless communication terminal, compensating the tested signal by the engaged function link, transmitting the compensated tested signal to the filter group, enabling the filter group to transmit the processed tested signal to the function link group, and enabling the function link group to output the filtered tested signal. The method and the system provided by the embodiment of the invention have the advantages that the problem of respective manual building of different test links due to different test specifications in the radio frequency consistency test process of the wireless communication terminal is solved; and the system integration of all models of test links for the radio frequency consistency test of a 2G / 3G (second generation / third generation) wireless communication terminal is realized.

A frequency-modulated continuous-wave (FMCW) radar system for level or distance measurement in which a frequency modulated signal to be transmitted to a target is mixed with an echo signal from the target to produce a beat signal that passes through an analog filter before being digitized and processed in a digital processor to determine the level or distance to be measured, where a test signal is generated by a signal generator, and a switch is controlled to connect the beat signal or the test signal to the analog filter, the signal generator generates the test signal as a broadband signal having a periodic waveform, e.g., a square wave, and the digital processor calculates a spectrum of the digitized filtered test signal by Fast Fourier Transform and generates a fault signal if the spectrum differs from a reference spectrum by a predetermined amount to allow for failure detection.

The invention provides a testing method and a device of a short message filter system. The method comprises the following steps: generating short message test information of short message filter testing data and sending short message test information to the short message filter system; receiving the filter result information fed back by the short message filter system to the short message test information; and comparing the filter result information and the standard test information and outputting the test result information of the short message filter system. According to the provided technical proposal, the device is directly connected with the short message filter system by a method for simulating a short message center, and can complete protocol conformance test and performance test to the short message filter system, thus reasonably regulating the short message filter system; simultaneously, the testing method and a device also can conveniently adjust various parameters and the sending quantity of the short messages; therefore, the provided technical proposal has the advantages of simple operation, high accuracy of testing result, high testing efficiency and the like.

A portable filter testing assembly for testing filter elements is provided. The portable filter testing assembly includes a first modular component including filter elements disposed within an interior and a fluid flow inlet. The testing assembly further includes a second modular component in fluid communication with the first modular component and includes fluid flow drawing means for drawing fluid flow through the filter elements of the first modular component such that the fluid flow is filtered by the filter elements. Each of the first modular component and second modular component includes an external structure of a modular International Organization for Standardization (ISO) shipping container. A kit of plural modular components for testing filter elements is provided. A method of using ISO modular components for testing filter elements is also provided.

Systems, methods and circuits for implementing a self test in a slowly varying sensor. In one particular case, a circuit is provided that includes two filters operating in parallel. One of the filters is tailored for filtering normal operational signals, and operates at a first oversampling rate. The other filter is tailored for filtering test signals, and operates at a second oversampling rate. The second oversampling rate is generally less than the first oversampling rate. In various cases, the filter tailored for filtering normal operational signals may be programmed for operation across a plurality of oversampling rates.

The invention relates to a CAN (Controller Area Network) bus controller parallel test method, which belongs to the technical field of electronic component detection, and solves the problems that an existing CAN bus controller test cannot realize real working state consideration, debugging and writing test of a PATTERN (Public Advanced Telecommunication Terrestrial Radio Network) is tedious and difficult. The method comprises the steps of acquiring a current test mode; if the test mode belongs to the CAN bus system test mode, connecting a first channel, and using a test machine for testing theCAN bus controller in a corresponding working mode; and if the test mode belongs to the test mode of the single-chip CAN bus controller, connecting a second channel, and testing the CAN bus controllerin a corresponding working mode by using a test machine. The CAN bus system test mode comprises at least one test mode of a message transceiving test, a message filtering test and a bus arbitration test. The single-chip CAN bus controller test mode comprises at least one test mode of a sending error test, a receiving error test and a node closing test.

A method for testing stability of a server includes the following steps. Providing a first user input interface for a user to input test parameters. Generating a control signal according to the input test parameters and transmitting the control signal to the BMC of the server. Controlling the server to start and shut down via the BMC. Detecting whether the tested characteristics are within specified ranges during each start and shutting down operation. Generating a SEL if any abnormal result is obtained and records a test time when the abnormal result is obtained in the SEL. Storing the generated SEL in a storage unit. Providing a second user input interface on the display for the user to input conditions to filter test results. And responding to the input conditions and outputting corresponding test results to the display.

The invention provides a filter element testing system. The filter element testing system comprises a test channel, a filter element mounting assembly, a blowback system and a monitoring control system, wherein the filter element mounting assembly is arranged in the test channel, the filter element mounting assembly comprises a first mounting part, a second mounting part and a third mounting partwhich are sequentially arranged in an airflow direction, and the first mounting part, the second mounting part and the third mounting part are respectively used for detachably mounting a filter element; the blowback system comprises a blowback air source, a blowback pipeline and a blowback control valve arranged on the blowback pipeline and used for controlling on-off of the blowback pipeline, oneend of the blowback pipeline is connected with the blowback air source, and the other end of the blowback pipeline extends to the second mounting part and the third mounting part; and the monitoringcontrol system comprises a controller, a display, an air inlet parameter acquisition unit and a filtering parameter acquisition unit. By configuring a plurality of filter elements of different models,the filter element testing system can perform filtering tests on air quality of different regions, and can select gas turbines suitable for different regions through comparison to perform system filter element configuration, so as to select reasonable and better filter element models.

The invention discloses a ventilating filter testboard which is characterized by comprising a primary filtering device; the primary filtering device is connected with an air volume section; the air volume section is connected with a closed mixing chamber; the closed mixing chamber is connected with a filter test device; and the filter test device is connected with a tail-section filter device. The invention has the advantages of simple structure, easiness to manufacture, low fault rate, reliability in installation and convenience for operation. A user can additionally install various instruments as required to obtain the desired data.

The invention provides an RT-LAB-based low-voltage APF hardware-in-the-loop simulation test method and system. The method comprises: collecting a system parameter and a signal of a digital model of alow-voltage APF running in real time in a real-time digital simulation machine; sending the system parameter and signal to a tested APF controller; and sending a control command and a pulse signal, generated by the tested APF controller based on the system parameter and the signal, to the low-voltage APF digital model running in real time in the real-time digital simulation machine. According to the invention, closed-loop control between the real-time digital simulation machine and the tested APF controller is realized; a technical problem that the actual performance of the actual APF controller can not be checked or the cost is high when the software full-digital simulation or field filtering test is employed is solved; and thus the actual performance checking of the actual APF controlleris realized and the test cost is lowered.

The invention provides a deep high stress hard roof stope dynamic disaster monitoring and early warning method, and belongs to the technical field of mine dynamic disaster prevention and control. Thedeep high stress hard roof stope dynamic disaster monitoring and early warning method comprises the steps that firstly geological materials are investigated, surveyed and obtained, and dynamic disaster influence factors are determined preliminarily; then a ground stress field test scheme is formulated, a ground stress field test is carried out nearby a stope, confining pressure filter test is carried out on a rock core of a ground stress test point in a laboratory, and ground stress distribution rule is concluded; meanwhile, a SURPAC geological modeling software is adopted, a three-dimensionalmodel of a coal seam and earth surface is established, the stope static ground stress field distribution characteristics are obtained, a disaster-causing mechanism is researched, and energy storage rock stratum structural characterization study is carried out; and finally, the monitoring scheme and equipment is determined, monitoring equipment is installed on site, and monitoring and early warning on site is carried out. According to the deep high stress hard roof stope dynamic disaster monitoring and early warning method, the monitoring scheme of tracing rock mass fracture tracks and stressfield migration characteristic is adopted, a classified early warning index system is applied. Energy level, time and position of dynamic disaster changing of an operation surface can be accurately predicted, and safe production of the operation surface is guaranteed.

The invention discloses a high-voltage light emitting diode street lamp, a fault diagnosis method and a readable storage medium. The fault diagnosis method comprises five steps of in an initializationstep, storing data samples of working current corresponding to all types of faults and a normal working state of the high-voltage light emitting diode street lamp in one working cycle, namely, faultdata samples; in a sampling step, collecting a test data sample of the working current of the high-voltage light emitting diode lamp in one complete working cycle according to a setting strategy; in aprocessing step, filtering the data of the collected test data sample; in a calculating step, calculating a similarity between the filtered test data sample and the stored fault data samples; in a diagnosis step, using the fault type corresponding to the fault data sample of which the similarity is greater than a set value as the fault of the lamp. The method achieves self-diagnosis of the faultof the high-voltage light emitting diode lamp.

A comparative discrimination spectral detection (CDSD) system for the identification of chemicals with overlapping spectral signatures, including: a radiation source for delivering radiation to a sample; a radiation collector for collecting radiation from the sample; a plurality of beam splitters for splitting the radiation collected from the sample into a plurality of radiation beams; a plurality of low-resolution optical filters for filtering the plurality of radiation beams; a plurality of radiation detectors for detecting the plurality filtered radiation beams; and a processor for: receiving a set of reference spectra related to a set of target chemicals and generating a set of base vectors for the set of target chemicals from the set of reference spectra, wherein the set of base vectors define a geometrical shape in a configuration space; receiving a set of filtered test spectra from the plurality of radiation detectors and generating a set of test vectors in the configuration space from the set of filtered test spectra; assessing a geometrical relationship of the set of test vectors and the geometrical shape defined by the set of base vectors in the configuration space; and based on the assessed geometrical relationship, establishing a probability that a given test spectrum or spectra matches a given reference spectrum or spectra.

The embodiment of the invention provides a method for measuring the hydrodynamic size of a polymer. The method comprises the steps of acquiring the initial hydrodynamic sizes of the polymer solution to be measured under multiple preset pressure values; acquiring a target working pressure according to each pressure value and the corresponding initial hydrodynamic size; under the target working pressure, performing a continuous filter test on the polymer solution to be measured, thus acquiring a target filter volume corresponding to each filter membrane with a preset hole diameter; separately computing a filter rate of the polymer solution to be measured that passes through each filter membrane with the preset hole diameter according to the target working pressure and the target filter volume corresponding to each filter membrane with the preset hole diameter; and according to each preset hole diameter and the corresponding filter rate, generating a relation curve between the hole diameters and the filter rates, acquiring the hole diameter corresponding to the inflection point of the relation curve, and using the hole diameter corresponding to the inflection point as the hydrodynamic size of the polymer solution to be measured. The concentration and cleanness of the polymer solution to be measured do not need to be acquired, and the accuracy of the measured hydrodynamic size is improved.

The invention relates to a packet filtering test method and device of a firewall, electronic equipment and a computer readable medium. The method comprises the following steps: acquiring a packet filtering strategy list for a firewall; generating a firewall command and a three-layer forwarding command based on the packet filtering strategy list; issuing the firewall command and the three-layer forwarding command to firewall equipment to be tested; writing the packet filtering strategy list into test equipment; and controlling the test equipment to generate flow data according to the packet filtering strategy list, and sending the flow data to the firewall equipment so as to test the firewall equipment. According to the packet filtering test method and device of the firewall, the electronic equipment and the computer readable medium disclosed by the invention, the ideal random packet filtering strategy can be directly generated based on the current network data, so that the matching effective condition of a large number of random packet filtering strategies in the current network is tested, and the packet filtering effective condition of the current network can be directly simulated and tested in a one-to-one manner.

The invention discloses a passive indoor positioning method, and the method comprises the steps: enabling the collected radio frequency network link RSS values, collected by a target at all coordinates in a non-empty room, as the training samples, and taking the coordinate numbers as the sample labels; carrying out the two-dimensional double-correlation distributed wavelet filtering of the training samples, and determines he filtered training samples; building an Adaboost.M2 integrated learning model based on a Geni decision tree, employing the filtered training samples and the sample labels for training, and determining the trained model; collecting the RSS values of the target when the target freely moves in a monitored region, taking the RSS values as test samples, carrying out the two-dimensional double-correlation distributed wavelet filtering of the test samples, inputting the filtered test samples into the trained model, and determining a positioning result. The method can distinguish and filter the RSS sample noises and random interference, and keeps the normal hop data. Meanwhile, a positioning process is very strong in generalization capability, and can improve the positioning accuracy and stability. The method also provides a corresponding device.

This invention relates to signal filter test method and device in signal process field, wherein the method comprises the following steps: a, generating one trigger signal when receiving the indication; b, when receiving trigger signal, generating one unit impulse sequence according to the matched range; c, inputting the said unit laser sequence to the digital filter; d, when receiving the trigger signal, storing the said unit sequence digital filter result; e, analyzing whether the digital filter is normal according to the said filter result.

The invention relates to a cross-flow ceramic film filter test device. The device comprises a support, wherein a circulating pump, a raw material tank and a clear solution tank are arranged on the support; one side of a bottom pipeline below the raw material tank is connected with the circulating pump, and the other side of the bottom pipeline is connected with a residue discharge valve of the raw material tank; the upper part of the raw material tank is connected with the upper part of a ceramic film assembly through an upper pipeline; a pressure gauge and a pressure adjusting valve are arranged on the upper pipeline; the lower part of the ceramic film assembly is connected with the circulating pump; a liquid outlet valve is arranged at the upper end of the ceramic film assembly, and a back flushing valve is arranged at the lower end of the ceramic film assembly; the lower part of the ceramic film assembly is connected with the raw material tank through a reflux pipeline; and a reflux valve is arranged on the reflux pipeline. The device can be recycled, avoids waste of resources, and is convenient and easy to operate.

An ion concentration meter measures a concentration of an ion in a solution by exposing both an ISFET gate and a reference electrode within a filtered test area. In preferred embodiments, the test area filters preferred compounds from a solution being tested by occluding an opening to the test area with a species-selective membrane. Contemplated species-selective membranes include silicate membranes, chalcogenide membranes, lanthanum fluoride membranes, and valinomycin membranes.