49results about How to "Accuracy has no effect" patented technology

The invention discloses a federated modeling method, device and equipment based on a block chain, and a storage medium. The method comprises the following steps: a training initiator issues configuration information to all training clients based on client information corresponding to the training clients when the number of the training clients is monitored to reach a preset number; the training initiator uploads a to-be-trained model to a main chain; and the training initiator determines a target model based on aggregation gradient and the to-be-trained model. Modeling of federated learning isrealized through the block chain; on the premise of protecting the privacy of federated learning data, the accuracy of federated learning is not affected, the training effect and model precision of federated learning are improved, model parameters such as gradients in transmission do not need to be modified, and the balance between privacy protection of the model parameters such as gradients andmodel convergence or model precision is achieved; and information leakage can be completely prevented, so the safety of data samples in federated learning is improved.

The invention provides a video intra-frame copy-move tampering detection method based on space and time relevance. The video intra-frame copy-move tampering detection method comprises the steps that firstly, downscaling processing is conducted on a video frame according to an establishment method of an image Gaussian pyramid; then, a time threshold value and a peak threshold value are set in a self-adaptive mode through time relevance and space relevance of the content of a monitoring video respectively; suspicious frame pairs which may have intra-frame copy-move tampering are screened out through phase correlation and a detection method based on block matching, and a binary image which describes the position of a tampered area is obtained through calculation; finally, suspicious frames are grouped through the time threshold value and then final judgment is carried out. Compared with similar algorithms, the video intra-frame copy-move tampering detection method based on space and time relevance has the advantages that the operation time is shortened greatly, and the robustness of an algorithm on Gaussian noise is enhanced. When the tampered area is described through the binary image, the operation of morphological filtering is added, interference caused by erroneous judgment points and noise points can be eliminated to a certain extent, and detection accuracy is improved.

The invention discloses a spindle locking device and relates to a precise spindle locking device. The spindle locking device consists of an internal expansion sleeve, an external expansion sleeve, a spring disc, a piston block and a fixed post, a fixing bolt and a fixing bolt. The internal expansion sleeve is fixed on a spindle and can rotate together with the internal expansion sleeve. The external expansion sleeve is sleeved on the internal expansion sleeve. Conical surfaces which are matched with each other are arranged between the internal expansion sleeve and the external expansion sleeve. The external expansion sleeve is sleeved on the internal expansion sleeve through the conical surfaces. The spring disc is sleeved on the internal expansion sleeve. The external expansion sleeve is positioned between a rear flange of the spindle and the spring disc. The spring disc is fixed with the rear flange through the fixed post and the fixing bolt. The spring disc and the external expansion sleeve are locked through the locking bolt. The piston block is arranged between the rear flange and the external expansion sleeve. Using the deformation characteristic of the spring disc and a taper locking mode, the locking device avoids any influence on the precision of the spindle when the spindle is locked and absolutely reliable locking is achieved, thereby ensuring the precision of processed parts, the precision of the spindle and the service life of the spindle.

Y-waveguide to be measured is connected into Sagnac interferometer light path to form complete Sagnac interferometer. Digital stepped wave with period of 4tau, equal step height and step width of tauis applied to the modulation electrode of Y waveguide, the detector output waveform is measured via A/D technology and the difference between level V1 of the 0-tau region and the level V2 of the tau-4tau is used as the criterion. The step height is altered from high to lower, the different between V1 and V2 is calculated in computer, and when the difference is zero the step height is recorded. According to the relationship between the step height and the semi-wave voltage, the semi-wave voltage of the Y waveguide may be obtained correctly. The said method is simple and high in precision and is not affected by light power variation, light path loss and various phase errors.

The invention discloses an ultra-long guide rail for a three-coordinate measuring machine. The ultra-long guide rail comprises branch guide rails and front and rear bases for the branch guide rails, wherein four bolt holes for arranging full-thread screws are formed in a lower bottom plate of each of the front and rear bases, and threaded holes are formed in vertical plates and upper bottom plates of the front and rear bases; an elastic adjusting bolt is arranged in one threaded hole of each vertical plate, and rigid adjusting bolts are arranged in the other threaded holes of each vertical plate; a square hole is formed in each of the two ends of each of main and auxiliary lateral surfaces of each branch guide rail, and a pair of stepped holes communicated with the corresponding square holes is formed in each of the front and rear end faces of each branch guide rail; springs are arranged in the stepped holes of the spliced end faces; the full-thread screws penetrate through the springs in the stepped holes; the two ends of the full-thread screws are positioned in the corresponding square holes respectively, and are locked by nuts. The ultra-long guide rail is high in planeness accuracy, straightness and splicing seam bonding accuracy, strong in splicing seam bonding strength, small in bonding seam thickness, simple in structure, easy to assemble, free of maintenance and low in cost, influence on accuracy when air bearings pass through bonding seams is avoided, and the accuracy, comprising the planeness and the straightness, of the guide rail is kept unchanged when temperature is changed.

The invention discloses a handheld portable measuring tool based on a laser tracker and a measuring method of the handheld portable measuring tool. The measuring tool is a measuring pen which is composed of a conical pen head and a pen rod provided with a target ball base positioning hole. After a target ball base is installed on the pen rod, the pen point of the pen head aligns to and makes contact with a measuring point, a target ball is held by hand to be led to the target ball base, the measuring pen rod is slowly rotated and is kept stable at four positions, the laser tracker measures the coordinate values at the four positions of the target ball, and then the position coordinates of the measuring point of the pen head can be calculated. The handheld portable measuring tool based on the laser tracker and the measuring method of the handheld portable measuring tool have the advantages that no target ball base positioning holes need to be machined in the measuring point, and only the condition that the micro plane where the measuring point is located enables the pen point to be kept stable and aligning when the measuring pen rotates needs to be ensured; the measuring pen does not need to be demarcated, and measuring pen manufacturing errors and form and location tolerances have no influence on the accuracy of a measuring result; the structure is simple, using is convenient, the algorithm can be programmed into the control program of the laser tracker, and the application range is wide.

The invention discloses a robot collision protection device. A gas input interface is formed in a shell, and an opening is formed in the lower side wall of the shell; a lower cover is movably connected with the shell, the lower cover comprises a base arranged in the shell, the base abuts against the lower side wall of the shell, the base covers and seals the opening, and the base and the shell areassembled to form a sealing cavity used for containing gas; an elastic assembly is arranged in the shell and abuts against the lower cover downwards. When the lower cover moves upwards under the action of external force, an exhaust gap is formed between the base and the lower side wall of the shell, and the exhaust gap and the opening form an air leakage channel capable of exhausting air in the sealing cavity outwards. An executing mechanism connecting assembly is arranged on the lower cover, and a robot tail end connecting assembly is arranged on the shell. According to the robot collision protection device, when collision or overload occurs, automatic load unloading is achieved, and a robot tail end executing mechanism and equipment are protected.

The invention provides a device for moving a cover (101) provided by the transport system (35) of a cover feeding station (1) along the transport direction (T) and laying and aligning the cover on a printing core (100) with an adhesive layer. The device comprises a pressing bench (28) capable of moving along the vertical and horizontal directions. The pressing bench comprises a pressing surface (24) used for substantially horizontally laying and pressing a cover. The transport systems (33, 35) are driven by individual drives. The pressing bench (28) has a driver (29) protruding from the pressing surface (24).

The invention provides a precise spindle locking device and relates to a locking device. The locking device consists of a fixed board, a flange, braking blocks, dowel bars and a locking oil cylinder, wherein the braking blocks and the dowel bars are arranged at two sides of the flange and are bilaterally symmetric. The flange is fixed on a spindle. The fixed board is fixed on a spindle box. The dowel bars are fixed on the fixed board. The braking blocks are fixed on the inner sides of the dowel bars. The locking oil cylinder is fixed between the left and right dowel bars. Stop pins are arranged on the outer sides of the dowel bars. The dowel bars can rotate by taking only rotating shafts as centers. Braking blocks are fixed on the dowel bars through rotating pins. Based on principles of self-centering and lever force amplification, the precise spindle locking device avoids any influence on the precision of the spindle when the spindle is locked and absolutely reliable locking is achieved, thereby ensuring the precision of processed parts, the precision of the spindle and the service life of the spindle.

A PCB bell mouth manufacturing method comprises the following steps: 1, selecting a taper drill bit according to the bell mouth sizes; 2, calculating a drilling depth according to the client required bell mouth orifices bore diameter, and writing the result <b=a/tg(r/2)> into a bell mouth boring program; 3, working in order according to a routine boring flow: a, mounting a joist plate; b, planting pins; c, loading a backing plate; d, loading a drilled plate; e, covering an aluminium sheet and pasting a gummed paper; f, starting a machine part mushroom head to press the aluminium sheet; g, covering a cold punching plate and using a gummed paper to firmly paste on same; 4, using an universal meter to confirm the aluminium sheet is connected with a drilling crew table top, and ensuring the unique coupling conduction portion between the aluminium sheet and the drilling crew table top is the mushroom head; 5, boring. The method calculates the drilling depth according to the tapper drilling bit angle and inputs the program, and the drilling crew can automatically make the bell mouth; the method is high in efficiency, and can make the precise bell mouths.

The invention discloses an on-line tracking method and system for eigenfrequency of a fiber-optic gyroscope. The fiber-optic gyroscope comprises an ASE light source, an optical fiber coupler, an integrated optical phase modulator and a light sensitive ring which are connected in sequence, the feedback end of the optical fiber coupler sequentially passes through the photoelectric detector, the pre-amplifier and the analog-to-digital converter and then is input to the signal receiving end of the logic processor, and the control end of the integrated optical phase modulator sequentially passes through the buffer amplifier and the digital-to-analog converter and then is connected to the signal sending end of the logic processor. The method comprises the following steps: constructing a modulation signal obtained by superposing a four-state square wave and a sawtooth wave, transmitting the modulation signal through a closed-loop control loop of the fiber-optic gyroscope to obtain a to-be-demodulated signal, demodulating an error between a modulation frequency and an actual frequency of the fiber-optic gyroscope, and dynamically adjusting a modulation frequency source clock of the fiber-optic gyroscope. Therefore, automatic tracking of the eigenfrequency of the fiber-optic gyroscope is realized, an angular velocity closed loop and a half-wave voltage closed loop are not influenced, and the precision of an angular velocity channel of the fiber-optic gyroscope is not influenced.

An electronic clinical thermometer includes a control circuit (4) which controls operation timing according to the operations of a measurement device (3) and a notification device (9) so that the measurement operation and the notification operation will not be performed simultaneously, thereby preventing lowering of the measurement accuracy due to battery voltage lowering. The electronic clinical thermometer (1) includes the measurement device (3) for measuring a body temperature, a drive device (8) for recording the notification data, the notification device (9) for performing notification by a drive signal formed according to the notification data, and the control circuit (4) for controlling the measurement operation and the notification operation. The control circuit (4) performs control so that the operation timing of the measurement device (3) is shifted from the operation timing of the notification device (9) according to their operation states so as to prevent simultaneous operations of the measurement and notification. Thus, in the electronic clinical thermometer performing notification operation, it is possible to prevent simultaneous execution of the measurement operation and notification operation, which in turn prevents measurement accuracy lowering due to battery voltage lowering.

The invention relates to the field of material performance characterization, in particular to a device for measuring thermal conductivity of a film with a steady-state method. The device comprises a sample analysis chamber, a vacuum acquisition system, a temperature control system and a signal monitoring and automatic recording system, wherein a sample is placed on a test chip in the sample analysis chamber, and the sample analysis chamber has a vacuum sealing function; the vacuum acquisition system is connected with the sample analysis chamber to provide a vacuum test environment for the sample; the temperature control system heats, cools or insulates the test chip and provides a variable temperature test environment for the sample; the signal monitoring and automatic recording system isconnected with the temperature control system for automatic temperature setting and recording. In-plane thermal conductivity of a thin film material is accurately measured, and especially when other commercial computers cannot be used for thermal conductivity testing due to too small size or high light transmittance and the like of the sample, thermal conductivity of the sample can be accurately and rapidly obtained by the device.

The invention relates to an aqueous transfer membrane demolding agent as well as a preparation method and application thereof. The aqueous transfer membrane demolding agent consists of the following components in parts by mass: 10-25% of an inorganic strong base, 10-20% of an organic weak base, 8-20% of a main solvent, 5-20% of a cosolvent, 2-5% of a surfactant, 1-15% of a chelating agent and thebalance of water. The aqueous transfer membrane demolding agent provided by the invention has the properties of rapidness and high efficiency, can be repeatedly used for a long time, has no influenceupon a substrate surface, particularly the precision of a sapphire cover plate, and has good application prospects in the precise processing industry.

The invention provides a preparation method for a PH-nano steel and iron corrosion inhibitor, which includes the following steps: (1) palm wax and sodium hydroxide are respectively prepared; the mixture of absolute ethyl alcohol and deionized water is prepared; first deionized water is then prepared; (2) the prepared palm wax is heated to melt until the palm wax is clear, and the liquid palm wax is poured into a first three-neck bottle; (3) the prepared sodium hydroxide is poured into the first deionized water until the sodium hydroxide is completely dissolved, and is then poured into the first three-neck bottle loaded with the liquid palm wax, and finally, the prepared mixture of absolute ethyl alcohol and deionized water is completely poured into the first three-neck bottle. The product prepared by the method has stable properties, good physicochemical properties and long anticorrosion time, and can resist high temperature, coating is thin, guns and cannons do not need to be cleaned before being used, and the product does not have adverse effects on the performance of the guns and the cannons after shooting.

The position of the elevator car (2) in the hoistway is important for the elevator control (4). Therefore, there is a need for an apparatus for generating channel information. In an embodiment of the invention, the device comprises an encoding device (11) connected to a long toothed belt (10) stretched over the height of the passage for detecting the movement of the elevator car (2) absolute position. The coding device (11) installed on the elevator car (2) has a toothed wheel (12). When the elevator car (2) moves in the elevator passage (1), the toothed wheel can be (11) DRIVE. The guide rollers (13) ensure the safe meshing of the toothed wheels (12) in the toothed wheel mechanism (12) of the long toothed belt (10). Each end of the long toothed belt (10) is associated with a transverse support element (14). A toothed strap reinforcement acting as a tension cord ensures that the necessary strap tension is maintained.