Student standing and sitting detection method for intelligent recorded broadcasting system for teaching

The invention discloses a student standing and sitting detection method for an intelligent recorded broadcasting system for teaching. At least two cameras are arranged in a student standing area. The detection method comprises the steps of: image acquisition and calibration, motion detection, student detection and student position reporting. In the image acquisition and calibration, an acquisition card of each camera acquires a frame of video, and each camera calibrates the student sitting area. In the motion detection, a moving part is detected and subtraction is adopted among images. The student detection comprises the steps of: moving target detection, double-camera student tracking and student standing and sitting judgment. The student position reporting is realized by reporting the standing, sitting and position information of a student to a broadcasting instruction module according to results obtained by the student detection. In the method, seats for the students are not required ...

Process for measuring non-metal plate thickness

The present invention discloses a method for measuring the thickness of a non-metal plate, and the method is applied to the non-damage measurement of the non-metal plate in a civil engineering structure field or other fields. The thickness measuring principle of the present invention is based on a spatial alternating electromagnetic field, the spatial magnetic field intensity (denoted with the induced voltage U of the coil of the point) at a certain point is monotonically attenuated following the increase of the distance H apart from the point, a numerical table to attribute the correlation of the induced voltage U and the distance H is established. When being tested, a transmitting coil produces the alternating magnetic field on one side of the non-metal plate, a receiving coil receives the signal of the alternating magnetic field on the other side of the non-metal plate, the signal of the alternating magnetic field is switched into the voltage signal U, the corresponding H value in the ...

Driver output with dynamic switching bias

A circuit of an output stage of a push-pull driver having dynamic biasing may include a stacked configuration of field effect transistors (PFETs) having a first PFET, a second PFET, and a third PFET, whereby the first PFET is connected to a first supply voltage, the third PFET is connected to an output of a switchable voltage bias generator circuit, and the second PFET is electrically connected between the first PFET and the third PFET. A transmission gate may be connected to a second supply voltage, whereby the transmission gate electrically connects the second supply voltage to an electrical connection between the first PFET and the second PFET based on a first operating state for preventing a voltage breakdown condition associated with the stacked configuration of PFETs. The third PFET is bias controlled via the switching of the output of the switchable voltage bias generator circuit.

Level-shifting differential amplifier

An analog level-shifting differential amplifier for providing signal amplitude and/or common mode adjustment is disclosed. In one example, a receiver system may include a first amplification stage that is powered, for example, via an I/O power supply (e.g., VDDIO) and a second amplification stage that is powered, for example, via a core logic power supply (e.g., VDD). Arranged between the first and second amplification stages may be the analog level-shifting differential amplifier. The analog level-shifting differential amplifier may include a set of variable impedance elements for controlling the output common mode and output signal swing of the level-shifting differential amplifier.

Teacher position detection method for teaching intelligent recording and playing system

The invention discloses a teacher position detection method for a teaching intelligent recording and playing system, comprising the steps of, firstly, image collection and module calibration: collecting a frame of image by using a video collection card, and calibrating the inside of a closed polygon as a dais region; secondly, motion detection: carrying out motion detection through background modeling and updating, background difference, frame difference, motion detection and motion combination; thirdly, teacher detection: determining the position of a teacher through motion target detection or size judgment; fourthly, teacher tracking: tracking the teacher after detecting a classroom; and fifthly, teacher position reporting: reporting the position of the teacher to a playing guiding system. The invention can detect an azimuth angle of the teacher and can also acquire whether the teacher is on the dais or not.

Crack depth test method and device

The invention relates to a method and a device for measuring crack depth. The method comprises the following steps that: a. sound velocity v in a measured solid medium is measured; b. a transmitting transducer and a receiving transducer are respectively arranged on two sides with a crack as symmetry; the space between the transmitting transducer and the receiving transducer is l1; the propagationtime of read sound wave is t1; the crack depth is calculated through the following formula: (see formula); c. the space between the transmitting transducer and the receiving transducer is set as l2, wherein l2 is more than or equal to 0.1h1 and less than or equal to 10h1, or l2 is more than or equal to 30mm and less than or equal to 500mm; sound-time value t2 is read; crack depth value h2 is calculated; the mean value h of d

and h2 is the crack depth. The method can obtain high-precision measurement result by utilizing few measuring points. The invention also provides a crack depth testercomprising ...

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Device and method for separating high-purity hydrogen chloride from sucralose byproduct hydrogen chloride

The invention relates to the technical field of chemical engineering, and discloses a device and a method for separating high-purity hydrogen chloride from sucralose byproduct hydrogen chloride, the sucralose byproduct hydrogen chloride is filled in a steel cylinder, the pressure is 5MPa, and the sucralose byproduct hydrogen chloride contains impurities of carbon dioxide, carbonyl sulfide and methane. The production energy consumption is reduced by utilizing the static pressure energy of steel cylinder feed gas and a compressor heat pump rectification method, the dependence on a cryogenic ice machine is avoided, the sucralose byproduct hydrogen chloride can be treated by the separation method and the device, a high-purity hydrogen chloride product is obtained, and the HCl content is greater than 99.9999%.

Video-based visibility detecting system

The invention provides a video-based visibility detecting system, which is characterized in that the detecting system comprises a front-end camera, a video capture device, a video analysis module and a reference result output module, wherein the front-end camera is connected to the video capture device which is used for transmitting real-time images to the video analysis module for analyzing the real-time images; and the reference result output module is used for outputting results obtained by analyzing the real-time images by the video analysis module. The system of the invention can judge the visibility of the present moment in accordance with the sharpness difference between the high visibility and the low visibility for scenery images shot by the camera, and has the characteristics of low device cost, convenient later manual confirmation (the visibility detection video is directly used to carry out confirmation), convenient construction and installation and high detection accuracy.

Animal anatomy device for obtaining mouse bone marrow cells

The invention discloses animal dissecting equipment for obtaining mouse bone marrow cells, which comprises a bottom plate, a supporting plate, an air supply mechanism, a clamping jaw assembly and a clamping jaw driving mechanism, the supporting plate is arranged above the bottom plate, the air supply mechanism is arranged between the bottom plate and the supporting plate, the clamping jaw driving mechanism is arranged in the supporting plate, and the clamping jaw driving mechanism is arranged on the supporting plate. A tensioning force control mechanism is installed at the power output end of the clamping jaw driving mechanism, and the clamping jaw assemblies are installed at the four corners of the bottom plate in a sliding mode. According to the device, the air supply mechanism can output a certain amount of air to the first resistance adjusting air bag and the second resistance adjusting air bag according to the weight of a mouse, the clamping degree of mouse limbs is adjusted through ...

Research method used for studying influences of Furin inhibitor on growth and metastasis of lung adenocarcinoma cells

The invention relates to a research method used for studying influences of Furin inhibitor on growth and metastasis of lung adenocarcinoma A549 cells. The research method comprises following steps: (1) cell proliferation is detected via MTT method; (2) A549 cell clonality is detected; (3) cell apoptosis is detected via Hochest33342/PI double staining (4) single layer cell migration experiment (wound healing) is performed; (5) Transwell invasion assay is performed; (6) cell migration related protein expression level is detected via Western blot; (7) enzyme linked immunosorbent assay is performed; and (8) statistic analysis is performed. According to the research method, influences of Furin inhibitor on growth and metastasis of lung adenocarcinoma A549 cells are studied, so that Furin inhibitor alpha1-PDX can be better used for inhibiting expression of Furin in lung adenocarcinoma A549 cells, and basis is provided for cancer treatment effectively.

Plug and play comprehensive traffic detection system

The invention relates to a plug and play comprehensive traffic detection system, which comprises the steps of: 1, capturing video through a video capturing system, and obtaining a video frame sequence through the captured video; 2, identifying the range and the direction of a traffic lane by utilizing the frame sequence obtained by a video capturing module; 3, detecting and tracking a moving object by a conventional method; and 4, analyzing the behavior of the object by combining the detection result and the tracking result for the moving object and the range and the direction of the traffic lane to obtain a traffic parameter detection result and a traffic event detection result. By the four steps, the plug and play comprehensive traffic detection system is realized. The system can detect traffic flow, actions in violation of regulations, and the like by automatically identifying the range and the direction of the traffic lane, and thus, the detection performance in a condition of adopting ...

Pull-rod-type diagonal cutting machine

The invention discloses a pull-rod-type diagonal cutting machine. The cutting machine is characterized in that a base, a work table, a support, a rocker, a slide rod assembly, a machine body, a drive device, a control device and a saw blade are included. A rotating table of the work table is rotatably arranged on the base and is provided with a cut groove in the front-back direction. The support is fixed to the rear portion of the upper side of the supporting portion of the base. A rocker assembly comprises the rocker, and the rocker is rotatably arranged at the rear end of the rotating table and can rotate leftwards and rightwards. The machine body is arranged on the rocker through the sliding rod assembly. The drive device is a direct-current brushless motor, a stator is fixed to the machine body, the axis of the stator is arranged horizontally in the left-right direction, a brushless motor outer rotor assembly is rotatably arranged on the machine body through a corresponding bearing ...

Research method for interaction between enhancers in whole genome

The invention relates to a research method for interaction between enhancers in a whole genome and belongs to the technical field of genes. The method includes the steps of (1) data conversion, (2) data filtering, (3) data annotation and (4) result analysis, wherein in the first step, enhancer data are converted into hg18 through liftover software of a UCSC website, and statistics and analysis are performed on the length and the distribution of the 1760 enhancers; in the second step, data with the distance between two chromatin fragments smaller than 100kb are filtered out, an hESC cell line, an IMR90 cell line and gene expression data of repeated experiments on the hESC cell line and the IMR90 cell line are obtained, and the average is solved; in the third step, the filtered data are compared into the enhancer data, and statistics is performed on the number of the enhancers capable of being captured by different cells; in the fourth step, mutual locus data of the enhancers within the whole-genome ...

Stone cutter

The invention discloses a stone cutter. The stone cutter comprises a workbench, a motor fixing frame, a water tank, a motor, a blade, and a sliding connection mechanism, wherein the motor is arranged on the motor fixing frame; the motor fixing frame is fixed on the water tank; the blade is mounted on the driving shaft of the motor; the workbench is positioned above the water tank; the sliding connection mechanism ensures that the water tank and the workbench are connected into a whole; the sliding connection mechanism can ensure that the workbench moves relative to the water tank. The stone cutter can cut stones longer than the workbench, so that the application range is expanded.

Level-Shifting Buffer

An analog level-shifting buffer for providing signal amplitude and/or common mode adjustment is disclosed. In one example, a receiver system may include a first amplification stage that is powered, for example, via an I/O power supply (e.g., VDDIO) and a second amplification stage that is powered, for example, via a core logic power supply (e.g., VDD). Arranged between the first and second amplification stages may be the analog level-shifting buffer. The analog level-shifting buffer may include a set of variable impedance elements for controlling the output common mode and output signal swing of the level-shifting buffer.

Renal pelvis pressure measurement gasbag expansion sheath

The utility model provides a renal pelvis pressure measurement gasbag expansion sheath comprises PVC sheath pipe, gasbag, water injection pipe and pressure -measuring pipe, the one end of PVC sheath pipe is equipped with metal location area, gasbag parcel around PVC sheath pipe outer, the both ends and the PVC sheath outside of tubes wall sealing connection of gasbag, vacuole formation between them, the one end and the metal location area contact of gasbag, the high -pressure water injection pump is connected to one end and cavity switch -on, the other end of water injection pipe, the pressure -measuring pipe runs through the cavity setting, and its one end is put through with the pressure measurement module on the anesthesia machine. The utility model discloses the renal pelvis pressure measurement gasbag expansion sheath that the technique provided advances menstruation skin nephroscope and gets shi shushi, but presses the change in the real time monitoring renal pelvis, bleeds in the ...

Electromagnetic switch

The utility model relates to an electromagnetic switch, comprising two input terminals and two output terminals. A contact C1 is connected between the input terminal I1 and the output terminal O 1; a start button AN1 is connected with a normally open contact C1 in parallel; a normally open contact C2 is connected between the input terminal I2 and the input terminal O2 in series; the start button AN2 is connected with the normally open contact C2 in parallel. The utility model is characterized in that a coil L of a contactor is crossed on both ends of the output terminal O 1 and the output terminal O 2; the normally open contact C1 is connected with a normally closed stop button AN3 in series after connected with the start button AN1 in parallel. The utility model can satisfy the requirement that the zero potential is prior, and has high safety.

Crack depth test method and device

The invention relates to a method and a device for measuring crack depth. The method comprises the following steps that: a. sound velocity v in a measured solid medium is measured; b. a transmitting transducer and a receiving transducer are respectively arranged on two sides with a crack as symmetry; the space between the transmitting transducer and the receiving transducer is l1; the propagation time of read sound wave is t1; the crack depth is calculated through the following formula: (see formula); c. the space between the transmitting transducer and the receiving transducer is set as l2, wherein l2 is more than or equal to 0.1h1 and less than or equal to 10h1, or l2 is more than or equal to 30mm and less than or equal to 500mm; sound-time value t2 is read; crack depth value h2 is calculated; the mean value h of d

and h2 is the crack depth. The method can obtain high-precision measurement result by utilizing few measuring points. The invention also provides a crack depth tester comprising ...

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Composition, kit and method for simultaneously detecting HSV-1, HSV-2 and VZV

The invention relates to a composition, a kit and a method for simultaneously detecting HSV-1, HSV-2 and VZV. The composition comprises a component A, a component B and a component C, wherein the component A comprises an upstream primer 1, a downstream primer 1 and a probe 1 which are used for detecting the human herpes simplex virus type 1, and nucleotide sequences of the upstream primer 1, the downstream primer 1 and the probe 1 are respectively shown as SEQ ID NO.1-3; the component B comprises an upstream primer 2, a downstream primer 2 and a probe 2 which are used for detecting the human herpes simplex virus type 2, and the nucleotide sequences of the upstream primer 2, the downstream primer 2 and the probe 2 are respectively shown as SEQ ID NO.4-6; the component C comprises an upstream primer 3, a downstream primer 3 and a probe 3 which are used for detecting varicella-zoster virus, and the nucleotide sequences of the upstream primer 3, the downstream primer 3 and the probe 3 are respectively ...

Lighting energy saving control system based on video

The invention relates to a lighting energy saving control system based on a video. The video captured by a camera is analyzed; once an object is found to enter an area covered by the lighting lamp, then the lighting lamp is turned on automatically or the brightness of the lighting lamp is increased. If no object is found to enter the area covered by the lighting lamp, then the lighting lamp is turned off after automatic delay for a certain period of time or the brightness of the lighting lamp is reduced. Compared with the traditional lighting lamp energy saving control technology, the invention has the characteristics of long operating distance, high sensitivity, simple installation and the like, and the on and off as well as the brightness of the lighting lamp can be controlled more carefully by better conforming to actual demands. Electric energy can be further saved on the basis of the traditional energy saving technology.

Energy-saving sucralose ethyl acetate wastewater treatment device and method

The invention relates to the technical field of chemical engineering, and discloses an energy-saving sucralose ethyl acetate wastewater treatment device and method, and the method comprises the following steps: 1) self heat exchange; 2) separating slag from gas; 3) rectification; and 4) splitting phases. According to the method, wastewater with high COD content is not generated, and the sucralose ethyl acetate wastewater is separated into three parts: 1) relatively pure water (H2O content is greater than 99.99%) is separated to be reused in a production workshop; 2) separating out an ethyl acetate phase (EA is greater than 96.85%), and recycling the ethyl acetate phase in a production workshop; and (3) separated slag liquid is subjected to innocent treatment in an incinerator. By arranging a first compressor, a second compressor and a self-heat-exchanger group, the compressors do work to a gas-phase material at the top of a rectifying tower and transfer heat to the sucralose ethyl acetate ...

Novel pipeline of liquid chlorine

The utility model provides a novel pipeline of liquid chlorine, manages and the inlayer pipe including outer, outer pipe with the tubular one -tenth toroidal cavity of inlayer, toroidal cavity is cut apart into the multistage by sealed ring baffle, the ring baffle relevant position the inlayer mouth of pipe is equipped with the valve, and is adjacent between the valve outer guan shangkai has PRESSURE DETECTOR, PRESSURE DETECTOR is connected with the pressure derailleur, the pressure derailleur is connected with the siren, be filled with nitrogen gas in the toroidal cavity. Set up the toroidal cavity who makes whole section pipeline through the aforesaid and become a plurality of independent units, saved the work load that the technical staff overhauld greatly. In addition, the packing of nitrogen gas is favorable to avoiding the inner tube to receive external disturbance in the cavity, and it is more stable to make chlorine carry.

Medicine for treating ulcerative colitis

The invention belongs to the technical field of traditional Chinese medicines, and relates to a medicine for treating ulcerative colitis. The medicine for treating ulcerative colitis disclosed by the invention is prepared from the following components: 15-26 parts by weight of pericarpium arecae, 10-20 parts by weight of coptis chinensis, 10 g of radix pseudostellariae, 10-20 parts by weight of Jianqu, 8-15 parts by weight of curcuma aromatica, 20-25 parts by weight of dandelion, 20-25 parts by weight of poria, 15-20 parts by weight of oroxylum indicum, 8-15 parts by weight of concha arcae, 15-20 parts by weight of cuttle bone, 20-39 g of astragalus membranaceus, 18-28 parts by weight of cyperus rotundus, and 6-12 parts by weight of liquorice. On the basis of a secret prescription handed down from ancestors, the medicine for treating ulcerative colitis disclosed by the invention is prepared through repeated experiments with the help of the summary of clinical experiences for many years; ...

Cable and T-shaped connecting device thereof

The utility model discloses a cable and a T-shaped connecting device thereof. The cable comprises cable connectors, an isolating framework and a reinforcing rib, wherein the isolating framework is connected to the outer side of the reinforcing rib in a sealing and sleeving mode, the cable connectors are arranged at the four corners of the isolating framework respectively, an insulating layer is arranged on the outer circle of each cable connector, an anti-flaming layer is arranged outside the cable connectors, the spaces between the anti-flaming layer and the cable connectors and the space between the anti-flaming layer and the isolating framework are filled with a crosslinked polyethylene insulating layer, a halogen-free low-smoke protective layer is arranged outside the anti-flaming layer, a sun-protection layer is arranged outside the halogen-free low-smoke protective layer, and grooves are formed in the outer circle of the sun-protection layer. The cable is reasonable in structure, ...

Watermelon seed soaking and germination accelerating device

The invention discloses a watermelon seed soaking and germination accelerating device, and relates to the technical field of watermelon planting.The watermelon seed soaking and germination accelerating device comprises a containing assembly and a shielding assembly, the containing assembly comprises a box body, a net plate and a rotating shaft, a clamping groove is formed in the top of the box body, the inner wall of the clamping groove is slidably connected with the net plate, a drainage pipe is arranged at the bottom of the box body, and the inner wall of the box body is rotatably connected with the rotating shaft; a spiral plate is arranged on the rotating shaft; the shielding assembly comprises a first winding drum, a second winding drum, a sunshade net and a heat preservation film, the two ends of the box body are fixedly connected with a first fixing base and a second fixing base respectively, the top of the first fixing base is rotationally connected with the first winding drum, ...

Dynamic driver boost circuits

In order to reduce slew rate and minimize delay skew, the invention adds a pull-down booster circuit connected to the gate of the driving transistor and/or a pull-up booster circuit connected the gate of the driving transistor. The pull-down booster circuit is adapted to dynamically pull-down the voltage at the gate of the driving transistor when the voltage level at the input to the logical enable device changes from a first voltage (e.g., a logical "0") to a second voltage (e.g., a logical "1"). The pull-up booster circuit is adapted to dynamically pull-up the voltage at the gate of the driving transistor when the voltage level at the input to the logical enable device changes from the second voltage to the first voltage.

Telecommunication fraud detection method and device and electronic equipment

The invention discloses a telecommunication fraud detection method and device and electronic equipment, and the method comprises the steps: carrying out the feature extraction of a target audio through employing a sound sequence, and obtaining a sound embedding vector comprising an emotion feature; identifying a text of the target audio, comparing each word in the text with a preset word bank in multiple language dimensions, and generating a language style vector; fusing the sound embedding vector and the language style vector through a deep learning model comprising a convolutional neural network and a recurrent neural network to obtain a fused feature vector comprising sound features and language style features; and detecting whether the target audio belongs to the audio of telecommunication fraud through the deep learning model. The method is high in telecommunication fraud detection accuracy and high in detection efficiency, and can be widely applied to the field of telecommunication ...

Waste tire online transaction platform based on big data

The invention relates to the technical field of junked tire online transaction, in particular to a junked tire online transaction platform based on big data, which comprises a server, a tire image analysis unit, a preprocessing evaluation unit, a background display unit, a market investigation analysis unit and a recommendation analysis unit, according to the invention, comprehensive analysis is carried out from the perspective of tire quality processing and online and offline sales conditions, and evaluation is carried out through two dimensions of a quality evaluation coefficient and a recommendation coefficient, so that background personnel can carry out reasonable online display according to the size sequence of display coefficients of tires of all sales volumes, and the display efficiency of the tires of all sales volumes is improved. Meanwhile, the reasonability of tire selling and the reasonability of recommendation display are improved, comprehensive analysis is carried out through ...

Teacher blackboard writing action detection method for intelligent teaching recording and playing system

The invention discloses a teacher blackboard writing action detection method for an intelligent teaching recording and playing system. The method comprises the following steps of: acquiring and marking an image; acquiring a frame of image by using a video acquisition card; calibrating a blackboard region which is in a closed polygon; detecting motion through background modeling and updating, background differencing, skin color differencing, motion detection and motion combination; detecting a region by methods such as an area method, a pixel statistical method, wherein the pixel statistical method comprises the following step of: calculating a valid binary number in a detection region, a calculation formula is shown in the specifications, and the area method comprises the following steps of: searching an Ibin communicated region; and calculating the total area s of the region; detecting blackboard writing; and if s is more than a certain threshold value, recognizing the blackboard writing ...

DRIVER OUTPUT WITH DYNAMIC SWITCHING BIAS

A circuit of an output stage of a push-pull driver having dynamic biasing may include a stacked configuration of field effect transistors (PFETs) having a first PFET, a second PFET, and a third PFET, whereby the first PFET is connected to a first supply voltage, the third PFET is connected to an output of a switchable voltage bias generator circuit, and the second PFET is electrically connected between the first PFET and the third PFET. A transmission gate may be connected to a second supply voltage, whereby the transmission gate electrically connects the second supply voltage to an electrical connection between the first PFET and the second PFET based on a first operating state for preventing a voltage breakdown condition associated with the stacked configuration of PFETs. The third PFET is bias controlled via the switching of the output of the switchable voltage bias generator circuit. 1. A circuit of an output stage of a push-pull driver having dynamic biasing , the circuit comprising:a first stacked configuration of p-type field effect transistors (PFETs) having a first PFET, a second PFET, and a third PFET, wherein the first PFET is connected to a first supply voltage, the third PFET is connected to an output of a first switchable voltage bias generator circuit, and the second PFET is electrically connected between the first PFET and the third PFET; anda first transmission gate connected to a second supply voltage, wherein the first transmission gate electrically connects the second supply voltage to an electrical connection between the first PFET and the second PFET based on a first operating state for preventing a first voltage breakdown condition associated with the first stacked configuration of PFETs, and wherein the third PFET is bias controlled via the switching of the output of the first switchable voltage bias generator circuit.2. The circuit of claim 1 , further comprising:a second stacked configuration of n-type field effect transistors (NFETs) ...

Level-Shifting Buffer

An analog level-shifting buffer for providing signal amplitude and/or common mode adjustment is disclosed. In one example, a receiver system may include a first amplification stage that is powered, for example, via an I/O power supply (e.g., VDDIO) and a second amplification stage that is powered, for example, via a core logic power supply (e.g., VDD). Arranged between the first and second amplification stages may be the analog level-shifting buffer. The analog level-shifting buffer may include a set of variable impedance elements for controlling the output common mode and output signal swing of the level-shifting buffer.

柔性屏剥离拆解装置

本实用新型属于显示屏维修装置技术领域，公开了一种柔性屏剥离拆解装置，其中，该装置包括：机架；固定台，所述固定台固定在机架上，固定台被配置为夹设并加热第一面壳和第二面壳中的一个；滚筒，所述滚筒滑设在所述机架上，所述滚筒被配置为滚动连接在铰链对应的柔性屏的内侧；夹紧机构，所述夹紧机构滑设在所述机架上并位于滚筒的后端，夹紧机构被配置为夹紧所述第一面壳和所述第二面壳中的另一个，剥离工况时，所述滚筒和所述夹紧机构同步向后运动。有益效果：面壳和屏幕之间缓慢地分离，能够不伤害面壳与屏幕，完成柔性屏剥离。