482results about How to "Shield interference" patented technology

The invention provides an extra high voltage transmission line online monitoring system, comprising that a data collection terminal collects comprehensive load, temperature of a transmission line, inclination angle of a pole, inclination angle of an insulator string, leakage current of the insulator string, meteorological information, vibration of transmission line and vibration of the pole, transmits the collected signals to a central data processing unit; the central data processing unit performs anti-interference process on each signals, packs and transmits to a background analysis device through a wireless communication network, and displays data information on a GIS electronic map; the background analysis device determines whether the transmission line is abnormal or not based on each signal and combination of mathematical model, transmits alarm information in time when being abnormal. The invention performs anti-interference process on the collected data, is capable of shielding interference of extra high voltage strong electromagnetic field and accurately monitoring working conditions of extra high voltage transmission line.

The invention discloses an assessment check and magnitude calibration method for an ultrahigh-frequency partial-discharging tester. Presently, no uniform standard is used for assessing and checking the ultrahigh-frequency partial-discharging tester, so that effectiveness and reliability of detecting results are affected. The method uses a high-frequency signal generator to output sine wave signals which are converted into radio-frequency pulse signals through a pulse modulating device, then the radio-frequency pulse signals are emitted by a core board in a GTEM small chamber, and finally the radio-frequency pulse signals are received by a sensor to be tested. Instrument performance can be assessed through three indexes of flexibility, linearity and bandwidth, and the measured magnitude of an instrument to be tested can be calibrated. The method can construct a pulse electromagnetic field with adjustable frequency and adjustable magnitude, can effectively shield interference of external electromagnetic signals, improves assessment check accuracy and is convenient to use.

The invention discloses a measuring method of biological electric impedance, which is characterized in that the method comprises constant-current outputting the sine wave pumping signal with preset frequency to the measuring electrode which is arranged in a region for measuring, inspiring the region for measuring, receiving and magnifying the analog signal which passes through the region for measuring, A/D converting the analog signal, extracting a plurality of digital signals in one cycle of A/D conversion, calculating a group of impedance values corresponding to a plurality of digital signals through the fast Fourier algorithm, calculating the impedance values of different frequency points in the range of preset frequency through repeating above steps to form an impedance frequency diagram, and calculating the characteristic parameter of the region for measuring at the time point through coincidence circularity method according to the impedance frequency diagram. The invention provides pure electrical signal through effectively shielding inference signal, thereby guaranteeing the measurement precision. The invention adopts the fast Fourier algorithm and coincidence circularity method, which improves the precision of impedance calculation and effectively reduces the cost of circuit.

A detection system of high sensitivity DC local discharge on large-capacity high voltage power device is prepared for providing high voltage DC voltage to balance detection impedance circuit by DC high voltage source, picking up local discharge signal of detected sample by balance detection impedance circuit, sending local discharge signal to differential amplification filtering circuit to carry out differential amplification filtering treatment than sending treated signal to data collection and analysis unit for obtaining detection and analysis result of local discharge signal.

The invention discloses a lightning protection power cable, which comprises a power transmission cable core and a coating layer for coating the cable core, wherein the coating layer comprises a shielding layer which shields the cable core, an outer tape layer which coats the shielding layer, an outer sheath which coats the outer tape layer, and a grounding layer which is arranged between the cable core and the shielding layer. In the lightning protection power cable, the grounding layer is arranged to improve the lightning protection capacity of the power cable, namely, the grounding layer conducts thunder and light entering the cable into the ground at the moment when a lightning fire occurs so as to ensure the security of the power cable and base station equipment connected with the power cable.

The invention relates to a mobile phone anti-theft tracking system and a mobile phone anti-theft tracking method implemented with the system. The method comprises the following steps: S1, registering a user account on a server, and binding the IMEI (International Mobile Equipment Identity) code of a mobile phone; S2, setting a password by a user, and switching the mobile phone from an ordinary mode to an anti-theft mode by a mode switching unit; S3, measuring whether or not each state of the mobile phone changes suddenly within a certain time interval or at a certain moment in real time by an anti-theft unit, and if so, notifying the mode switching unit to switch the mobile phone mode to a tracking mode; and S4, tracking the current position information of the mobile phone with a tracking unit, acquiring information of an environment in which the mobile phone is positioned, and uploading the acquired information to the server for the user to learn. Detection on whether or not the mobile phone is in a lost state can be performed rapidly without increasing additional hardware cost; the manual disturbance to the tracking mode after the mobile phone is stolen is shielded effectively; error operation is reduced; the tracking time is prolonged; the tracking stability is enhanced; and the mobile phone finding success rate is increased.

The embodiment of the invention provides a color film substrate and a display device, and relates to the technical field of display. The efficient light filtering effect can be achieved, and the backlight utilization rate is increased. The color film substrate comprises multiple pixel units. Each pixel unit comprises a blue sub-pixel, a green sub-pixel and a red sub-pixel. Each blue sub-pixel comprises a first photonic crystal layer on a substrate body and used for making blue light emitted to the color film substrate to pass. Each green sub-pixel comprises a second photonic crystal layer and a first light emitting medium layer which are arranged on the substrate body in sequence, wherein the first light emitting medium layer emits green light under the stimulation of the blue light, and the second photonic crystal layer is used for making the green light to pass. Each red sub-pixel comprises a third photonic crystal layer and a second light emitting medium layer which are sequentially arranged on the substrate body in sequence, wherein the second light emitting medium layer emits red light under the stimulation of the blue light, and the third photonic crystal layer is used for making the red light to pass. The invention further provides a preparation method for the color film substrate and the display device with the color film substrate.

The invention discloses an on-line engine oil quality monitoring system and method adopting multi-sensor information fusion. The engine oil quality monitoring system comprises a test oil circuit control valve, a metal abrasive grain detection device, a comprehensive quality detection device, a viscosity detection device, an engine oil cooling device, a data processing module, an STM32 measurement and control main unit, a man-machine interaction module and the like, wherein the viscosity detection device consists of an engine oil sampling device, a thermostatic oil-bath box, a heater, a constant-flow pump, a liquid level sensor, an oil-bath temperature sensor, a sampling temperature sensor, a pressure sensor, a balanced flow sensor and a pressure control valve. The on-line engine oil quality monitoring system is mounted at the downstream of a lubrication circuit oil pump of an automobile engine, can monitor the viscosity of engine oil, the content of metal abrasive grains and changes of such comprehensive qualities of engine oil as the pH value and the moisture content on line, adopts the multi-sensor information fusion technology to comprehensively analyze the oil state, displays information of the oil state through a display and sends an early-warning signal if necessary.

The invention relates to microorganism immobilization technology, in particular to a method for preparing immobilized granules for remediation of polycyclic aromatic hydrocarbons (PAHs) polluted soil. Mix the glue evenly, and pass through a granulator with a diameter of 1-4.00mm under natural conditions of 25-40°C and pH to prepare immobilized granules at a dripping speed of 20-30 drops/min. Chemically cross-link, then stand in the fixative for 23-58 hours, and finally soak in sterile water for 24-72 hours, rinse off the residual liquid, multiply and cultivate, and set aside; the mass ratio of the gel solution is: alginic acid Sodium (Na·Alg) 2-3%, (150 mesh) activated carbon, red brick powder, peat soil and/or fly ash 0.3-0.6%, and the balance is water. The invention can greatly improve the mechanical strength, elasticity and slow-release performance of the immobilized particles.

The invention discloses a calibration device for a nuclear magnetic resonance well logger, which comprises a circulation system, a shielding dial drum and a lithologic medium placing board, wherein the circulation system consists of a mixing vessel, a vacuum valve and a Faraday dial drum; the Faraday dial drum is provided with an instrument outer cylinder which is used for placing a detecting instrument and a corresponding probe; the shielding dial drum is sleeved outside the instrument outer cylinder and used for circulating flow of a calibration solution; the lithologic medium placing board is arranged inside the shielding dial drum and used for placing solid lithologic media; a skylight for placing and taking the solid lithologic media is also arranged on the shielding dial drum; and a skylight cover is arranged on the skylight. The calibration device for the nuclear magnetic resonance well logger not only effectively reduces the volume of the calibration device and shields interference of an external electromagnetic field but also can conveniently and flexibly replace the lithologic media, accurately calibrate the investigation depth and the sensitivity on the lithologic media with various porosities, and provide accurate scale data for the nuclear magnetic resonance well logger.

The invention provides a magnetically-shielded combined type friction-abrasion testing machine, which comprises a rack, a rotating mechanism, a horizontal adjusting platform, a reciprocating mechanism and a friction loading mechanism, wherein the rack consists of a bottom-layer platform, a middle-layer platform and a top-layer platform, and the middle-layer platform and the top-layer platform are positioned on the bottom-layer platform; the rotating mechanism is arranged on the middle-layer platform, the upper end of the rotating mechanism is connected with a rotating disc for placing samples, and a first magnetic shielding case is arranged at the outer peripheral side of the rotating disc; the horizontal adjusting platform is arranged on the middle-layer platform and arranged on one side of the rotating mechanism along a second direction, and the horizontal adjusting platform is provided with a turnplate seat capable of moving along the second direction; the reciprocating mechanism comprises a cylinder and a linear guide rail, the cylinder is arranged on the top-layer platform, a sample fixing seat is arranged on a slider of the linear guide rail, the linear guide rail and the horizontal adjusting platform are adjacent along a first direction, a second magnetic shielding case is arranged on the outer peripheral side of the linear guide rail, an extension rod of the cylinder is arranged on the second magnetic shielding case in a penetration manner and connected with the sample fixing seat and can drive the sample fixing seat to do reciprocating motion along the second direction; the friction loading mechanism consists of a support frame, a lifting platform and a loading assembly.

The invention provides a pipeline leakage monitoring system and method based on sound wave and negative pressure wave hybrid monitoring, and relates to the technical field of pipeline risk prediction.The system comprises pressure sensors, sound wave sensors, lower computers, exchangers and upper computers which are located at the head end and the tail end of a pipeline, wherein the lower computers control the pressure sensors and the sound wave sensors to acquire pressure and sound wave data, preprocess the pressure and sound wave data and then send the pressure and sound wave data to the upper computers through the exchangers, and the upper computers execute leakage monitoring programs in the upper computers, receive and analyze the pressure and sound wave data transmitted by the lower computers through pressure and sound wave data integration and storage modules, carry out secondary filtering, dimensionless processing and semi-supervised Fisher discriminant analysis processing on the acquired data through data processing module, judge whether the pipeline leaks or not through pipeline leakage monitoring modules, and carry out hybrid positioning on the pressure signals and the sound wave signals. According to the pipeline leakage monitoring system and method, noise interference can be better shielded, when a signal source is changed, the accuracy of the restored signals afterfiltering can be guaranteed, and positioning of leakage points can be more accurate.

The invention discloses a differential piezoelectric digital geophone. The differential piezoelectric digital geophone comprises a geophone core which comprises a cylindrical shielding case, a base, piezoelectric elements, mass blocks, a signal conditioning unit, a signal preprocessing unit, feed-through capacitors and outgoing cables. The base is arranged in the center of the shielding case and in rigid connection with the shielding case; the two groups of piezoelectric elements are symmetrically attached to two sides of the base, and the two mass blocks are symmetrically attached to the outer sides of one group of piezoelectric elements; the two groups of piezoelectric elements are connected with an input end of the signal conditioning unit through outgaining electrodes at two ends of the piezoelectric elements, an output end of the signal conditioning unit is connected with an input end of the signal processing unit, and an output end of the signal processing unit is connected with the outgaining cables through the feed-through capacitors. By means of the geophone core in the symmetrical structure, differential signal output and direct digital processing of signals, the differential piezoelectric digital geophone has the advantages of high flexibility, high antijamming capability, wide dynamic range, portability, durability and the like.

The invention discloses an IPv4 and IPv6-based detection method for denial of service attacks. The method comprises the following steps: during usual operation detection, a system only picks up basic operation parameters in flow, and a simple flow model is used for judging possible abnormalities; under the condition that abnormalities exist, a service flow model is used for judging abnormalities; and under the condition that abnormalities are confirmed, an attack flow model is used for judging attack types. The invention further discloses an IPv4 and IPv6-based detection system for denial of service attacks, wherein the system comprises a flow model module, an operation monitoring module, an abnormality conforming module, and an attack type conforming module and handling module. The method and the system provided by the invention basically shield interference of large flow data of the whole network to analysis, and are high in relevance ratio accuracy of DOS (disk operating system)/DDOS (diagnostic disk operating system) attacks.

The invention relates to an OFDM (Orthogonal Frequency Division Multiplexing) time synchronization algorithm based on a conjugate symmetric sequence. The OFDM time synchronization algorithm comprises the steps of constructing a sequence with conjugate symmetry; carrying out symmetric related calculation at a receiving end by using the conjugate symmetry of the sequence so as to obtain a related peak value of a timing measurement function; and determining a beginning position of an OFDM signal by using the position of the related peak value so as to finish time synchronization. By using the invention, the adverse effect on the time synchronization, caused by a cyclic prefix and the conjugate symmetry of the sequence, is overcome, and higher timing accuracy is obtained; and the OFDM time synchronization algorithm based on the conjugate symmetric sequence, provided by the invention, can be effectively used for the time synchronization of the OFDM system under a multipath channel.

The invention discloses an abnormal event detection method based on a fixed-position camera monitoring video, and the method comprises the steps: A, obtaining a frame of image shot by a camera under the normal condition, calibrating an invariant region, and enabling the image of the invariant region to serve as an initial reference image; B, acquiring a real-time image shot by the camera after a preset sampling interval time, and extracting an image of an invariant region of the real-time image as a judgment image according to the invariant region; C, comparing the similarity between the judgment image and the reference image, if the similarity is within a preset normal similarity range, replacing the current reference image with the judgment image, and then turning to the step B; Otherwise, judging that an abnormal event occurs. The invention further discloses an abnormal event detection device based on the monitoring video of the fixed-position camera. According to the invention, themethod can achieve the accurate and automatic recognition of the interference of the camera and the abnormity in a monitoring scene, is better in accuracy and real-time performance, and is low in software and hardware requirements.

The invention discloses a double-bit flash memory which includes two adjacent SONOS memories which are in the same active region and a selection pipe located between the two SONOS memories. The position and size of a gate structure of the selection pipe are directly defined by self alignment of two adjacent side walls between the two SONOS memories. The invention also discloses a manufacturing method for the double-bit flash memory. The invention also discloses an operation method for a double-bit flash memory. The double-bit flash memory is capable of realizing storage of two-digit data in a single unit structure so that not only is storage density improved and device area reduced, but interferences between the two-digit data are also prevented and thus the reliability of the data is improved.

The invention relates to cell immobilization technology, in particular to a preparation method for immobilized bacteria used in the restoration of polycyclic aromatic hydrocarbons contaminated soil, using 0.25-1.00mm red brick powder, fly ash, vermiculite, peat soil, diatoms Soil or coke powder is used as the carrier material. After sterilization, it is inserted into the bacterial solution, and then multiplied and cultivated to obtain the desired immobilized particles. The immobilized biological product prepared according to the formula of the invention has a good remediation effect on soil polluted by high-molecular-weight polycyclic aromatic hydrocarbons, and is a reliable new environment-friendly biological product.

The invention provides a system and method for monitoring the pipeline leakage based on high-and-low-frequency hybrid detection. The system comprises a head end ultrahigh frequency sensor, an end ultrahigh frequency sensor, a head end acceleration sensor, an end acceleration sensor, a head end lower computer, an end lower computer, a head end upper computer and an end upper computer; a method based on the system is also provided, the method comprises the following steps of: acquiring high-frequency and low-frequency mixed historical data and classifying the working conditions of the high-frequency and low-frequency mixed historical data, performing preprocessing, multi-information domain analysis processing and feature extraction, processing by using a covariance kernel slice inverse regression algorithm to obtain a feature vector subspace, acquiring high-frequency and low-frequency mixed real-time data, obtaining the feature vector subspace according to the steps of acquiring the historical data, classifying the feature vector subspace by using a linear discriminant analysis, calculating the similarity, obtaining the real-time data classification result, and if the leakage exists,calculating the leakage position, providing a reliable data basis for the troubleshooting. The accuracy of the leakage feature value is ensured, the false alarm is reduced to the maximum extent, andmore accurate judgment is made on the leakage of a small flow.

The invention provides a liquid crystal display panel, which comprises a substrate, a plurality of signal wires, a common electrode and a pixel electrode. The signal wires are arranged on the substrate along the row and line directions. The signal wires arranged along the row direction transmit scanning signals and the signal wires arranged along the line direction transmit data signals. The pixelelectrode is arranged on one side where the signal wires are far away from the substrate and is insulated from the signal wires. In every two signal wires perpendicular to each other, one signal wireis discontinuous and is arranged on both sides of the other signal wire. The liquid crystal display panel further comprises a connecting wire which is arranged between the signal wires and the pixelelectrode and connects the discontinuous signal wires. The common electrode and the connecting wire are arranged on the same layer which covers the signal wires transmitting the data signals in the direction perpendicular to the plane of the substrate. The liquid crystal display panel has higher aperture opening ratio. The invention also provides a manufacturing method for the liquid crystal display panel.

The invention discloses a self-supporting lightning-proof power cable. The power cable comprises a power transmission cable core, a covering layer for covering the cable core and a suspension wire connected with the covering layer, wherein the covering layer comprises a shielding layer for shielding the cable core, an external tape layer for covering the shielding layer, an external sheath for covering the external tape layer and a grounding layer arranged between the cable core and the shielding layer. The lightning-proof capacity of the power cable is increased by arranging the grounding layer, namely the grounding layer instantaneously conducts the lightning entering the cable into ground to ensure the safety of the power cable and base station equipment connected with the power cable when the lightning strike occurs.