167results about How to "Guaranteed Regularity" patented technology

The present invention provides providing predictable scheduling of programs using repeating precomputed schedules on discretely scheduled and / or multiprocessor operating systems. In one embodiment, a scheduler accesses an activity scheduling graph. The activity scheduling graph is comprised of nodes each representing a recurring execution interval, and has one root, one or more leaves, and at least one path from the root to each leaf. Each node is on at least one path from the root to a leaf, and the number of times the execution interval represented by each node occurs during the traversal of the graph is equal to the number of paths from the root to a leaf that the node is on. Each node has associated with it an execution interval length, and is adapted to being dedicated to executing the threads of a single activity. There may be one scheduling graph for each processor, or a scheduling graph may traverse multiple processors. Start and end times for reservations and constraints are adjusted to compensate for the granularity of the clock of the system. Furthermore, the scheduler may use an existing priority-based scheduler in order to cause scheduling decisions it has made to be acted upon.

The invention discloses a reconstruction method of a triangular mesh model, belonging to the field of computer graphics; the method comprises the following steps: an input model is parameterized to acubic surface, and a cube is drawn by utilizing a cubic parametric coordinate and topology connection relationship of the model; for a triangle which spans two or three surfaces of the cube, intersection point of the side of the triangle and the edge of the cube and attribute value of a top point contained by the triangle are extracted, and a standard cube is generated according to the attribute value of an extracted point and the topology connection relationship of the model; the parametric coordinate of the standard cube is utilized as a spatial coordinate, a geometric image and a differencegeometric image of the model are constructed; a re-sampling model is restrained by the difference geometric image to reconstruct the model. The reconstruction method can well keep the model detail before sampling, and a regular geometric model is generated, so as to be beneficial to acceleration drawing of the model; when variant interpolation of the model is carried out, the generated intermediate model also can keep smooth geometric detail.

The invention relates to a tube bending machine. The tube bending machine comprises a rack, wherein a loading mechanism capable of outputting front-and-back linear displacement actions is arranged on the rack, a prop-bending die is in transmission connection with a power output end of the loading mechanism, two support wheels matched with the prop-bending die to bend corresponding metal tubes are also rotationally arranged on the rack, metal tube limiting mechanisms are arranged in positions, which are located on left and right sides of each support wheel, of the rack, each metal tube limiting mechanism is provided with a limiting channel which extends linearly and laterally and is penetrated through by the corresponding end of each metal tube, and the limiting channels are located on back sides of the corresponding support wheels respectively and provided with channel walls which are in stop fit with the corresponding ends of the metal tubes in the front-and-back direction and in sliding friction guide fit with the corresponding ends of the metal tubes bilaterally when the prop-bending die and the support wheels prop and press the metal tubes. The tube bending machine is not required to be manually held by an operator during usage and can bend R angles.

The present invention provides providing predictable scheduling of programs using repeating precomputed schedules on discretely scheduled and / or multiprocessor operating systems. In one embodiment, a scheduler accesses an activity scheduling graph. The activity scheduling graph is comprised of nodes each representing a recurring execution interval, and has one root, one or more leaves, and at least one path from the root to each leaf. Each node is on at least one path from the root to a leaf, and the number of times the execution interval represented by each node occurs during the traversal of the graph is equal to the number of paths from the root to a leaf that the node is on. Each node has associated with it an execution interval length, and is adapted to being dedicated to executing the threads of a single activity. There may be one scheduling graph for each processor, or a scheduling graph may traverse multiple processors. Start and end times for reservations and constraints are adjusted to compensate for the granularity of the clock of the system. Furthermore, the scheduler may use an existing priority-based scheduler in order to cause scheduling decisions it has made to be acted upon.

The invention discloses a forging and striking production process for a blank with a rectangular section. Equipment adopted in the striking and forging production process comprises two pairs of forging hammers which are mutually vertically distributed, wherein one pair of forging hammers include a first hammer and a second hammer, and the other pair of forging hammers include a third hammer and a fourth hammer; and the section of the blank is forged and struck for seven passes to become rectangular, approximately square, octagonal until circular. Due to the adoption of the technical scheme, a process for forging and striking the blank with the rectangular section to form a circular blank is precisely obtained through simple and effective derivation of equations by utilizing the forging characteristics of a radial forging machine; the forging and striking production process accords with a common forging and striking deformation process, the regularity of the shape of a forged product is ensured through a reasonable deformation step; and each pass reduction is determined through careful calculation, therefore, the quality of the forged blank is ensured, and defects such as folding, cracks and the like are prevented from being caused.

The invention discloses a method for producing a through-hole structure in a PDMS micro-fluidic chip, which is characterized in that a micro-column or a micro-tube is fixed at the position on the chipmold where a through-hole structure is planed to be produced with the auxiliary magnetic attraction, and then PDMS preformed polymer is integrally poured and curing bonded for producing the PDMS micro-fluidic chip having through-hole structure with a high depth-to-width ratio. The invention provides a method for shaping a micro-fluidic chip and producing a through-hole at one time, which simplifies the micro-fluidic chip production technique, and improves the accuracy of through-hole production by the fixing of the micro-column or the microtubule and the chip mold, with integral pouring implement, thereby guaranteeing the regular shape of the through-hole and avoiding the problems of the irregular through-hole shape and damaged micro-tube structure or the like. In addition, the micro-magnetic column arrangement is inlaid and fixed by the prefabricated mold, which can improve the density of the through-hole production too and realize mass processing and production.

The invention relates to a cooling fin point welding machine of a transformer finned radiator, and belongs to the technical field of welding machines. The cooling fin point welding machine comprises a rack, upper and lower point welding mechanisms, and a cooling fin convey mechanism, wherein the rack is composed of a pair of upright posts and a beam, and an air tank is arranged on the beam; the upper point welding mechanism comprises a first base and at least two groups of upper point welding devices and upper electric welders, and the lower point welding mechanism comprises a second base, lower point welding devices and lower electric welders the quantity of which are equal to that of the upper point welding devices; the lower point welding devices are electrically connected with the lower electric welders, and also are connected with a gas path of the air tank; and the second base is arranged on the bottom corresponding to the space between the pair of upright posts, and is corresponding to the first base. The cooling fin point welding machine provided by the invention has the advantages of being capable of remarkably improving point welding efficiency on cooling fins on the premise of not increasing the quantity of single point welding machines, being capable of saving equipment investment, reducing occupancy space of a production field and saving labor resources, and particularly being capable of insuring finishing effects of bonding points and guaranteeing the welding quality of the cooling fins.

The embodiment of that present application provides a hot word recommendation method and apparatus, wherein, the method includes: classifying alternative hot words in advance, determining the categoryof each alternative hot word, when matching the recommended hot words for the query keywords entered by the user in the information search box of the target search engine, selecting a plurality of target hot words matched with the query keyword as recommended hot words based on the category to which each candidate hot word belongs, at the same time, displaying the selected recommendation hot wordclassification to the user in the designated area on the search page of the target search engine. The method can not only improve the accuracy of the determined recommended hot words, but also ensurethe regularity of the display of the recommended hot words, so that users can quickly and accurately lock to the hot words they really need to query according to the hot words category, thereby improving the timeliness of users to obtain their own information of interest.

The present invention provides providing predictable scheduling of programs using repeating precomputed schedules on discretely scheduled and / or multiprocessor operating systems. In one embodiment, a scheduler accesses an activity scheduling graph. The activity scheduling graph is comprised of nodes each representing a recurring execution interval, and has one root, one or more leaves, and at least one path from the root to each leaf. Each node is on at least one path from the root to a leaf, and the number of times the execution interval represented by each node occurs during the traversal of the graph is equal to the number of paths from the root to a leaf that the node is on. Each node has associated with it an execution interval length, and is adapted to being dedicated to executing the threads of a single activity. There may be one scheduling graph for each processor, or a scheduling graph may traverse multiple processors. Start and end times for reservations and constraints are adjusted to compensate for the granularity of the clock of the system. Furthermore, the scheduler may use an existing priority-based scheduler in order to cause scheduling decisions it has made to be acted upon.

The invention discloses a cement flattening compacting device for road construction. The cement flattening compacting device comprises a rack and a base. The rack is mounted on the base, and the rackis provided with a material box, a conveying mechanism, a transmission device and a transmission frame. The transmission device comprises a sliding bar, the sliding bar is vertically mounted on the rack, a top plate and a bottom plate are mounted on the sliding bar, the top plate and the bottom plate are mounted on the sliding bar through sliding sleeves, the top ends of the top plate and the bottom plate are provided with a first transmission link for connecting the two, the front ends of the top plate and the bottom plate are provided with a second transmission link for connecting the two, the transmission frame is mounted at the rear end of the rack, a sliding frame is mounted inside an inner cavity in the transmission frame, sliding blocks are mounted at the upper and lower ends of thesliding frame, the upper and lower sides of the inner wall of the transmission frame are provided with sliding rails, and the sliding blocks are limited in the sliding rails. The cement flattening compacting device has high stability and high operation consistency, can perform fully automated operation, and can save a lot of human resources.

The specific high surface area of alumind coating features in the paste preparation by grinding alumind and batching for pastes with 0.2-1% organic alcohol agglomerate surface activator, with even blending for use, coating said alumind to carrier surface, through drying, baking and aging treatment to make the coating. It also provides the alumind coating and metal carrier three functions catalysts. The coating is in crust, big in specific surface area, stable and reliable in performance.

The invention relates to a polylactic acid block copolymer and a preparation method thereof. A polylactic acid block copolymer of a high-melting polyester is difficult to prepare by the existing method. The polylactic acid block copolymer provided by the invention is a di-block copolymer expressed as A-b-B, wherein A is a single-terminal hydroxyl aromatic polyester block and B is a polylactic acid block. The invention adopts a solution polymerization method as follows: the soluble reactant single-terminal hydroxyl aromatic polyester and an organic solvent of lactide are used as reaction media, a tin salt is used as a catalyst, and the single-terminal hydroxyl aromatic polyester is used as an initiating agent to initiate ring-opening polymerization of the lactide, thereby effectively introducing the polylactic acid block by the method. By the method provided by the invention, the polymerization temperature can be controlled in a range in which the polylactic acid and the lactide can not be degraded or even racemized, thereby effectively inhibiting the occurrence of an ester exchange reaction, ensuring the regularity of chain blocks, and successfully preparing the block copolymer of polylactic acid and polyester including the high-melting aromatic polyester.

The invention relates to a simulation method based on a three-dimensional simplified model of a lithium ion battery, which comprises the following steps of: (1) selecting a commercial lithium ion softpackage battery, and establishing three-dimensional layered electrochemistry-electrochemistry of three sizes of the battery according to relevant parameters; A; a thermal coupling model: a model (OUM) of one cell, a model (TUM) of two cells, and a half-sized model (HSM); (2) respectively comparing the thermal behavior and the electrochemical property of the lithium ion battery under the three simulation methods; A; and (3) discussing whether a simulation method of a full-size model can be replaced by a simulation method of a unit model, and giving a basis. According to the method, t, the three-dimensional model simulation method of the lithium ion battery can be simplified, a simulation method based on a unit model is used for replacing a simulation method of a full-size model, t, the calculation time is saved, t, the model accuracy can be ensured, and a certain guidance basis is provided for simulation researchers.

The invention discloses a preparation method of a high-heat-conducting polyphenylene sulfide material and the prepared material. The preparation method aims at solving the problems that when conventional polyphenylene sulfide is processed, as cross linkage is easily caused, the regularity and the crystallinity of polyphenylene sulfide molecules are greatly reduced, the molecular large conjugated structure is damaged, the formation of a heat conduction channel is influenced, and the heat conduction property of polyphenylene sulfide resin is reduced. The preparation method comprises the steps of high-crystallinity polyphenylene sulfide resin preparation, high-heat-conducting fiber preparation and high-heat-conducting polyphenylene sulfide material preparation. The high-heat-conducting polyphenylene sulfide material prepared by the method has the characteristics that the using amount of heat-conducting packing is little, the heat-conducting coefficient is greater than 5w / m.k, and the overall performances such as mechanical property are excellent. As the high-heat-conducting polyphenylene sulfide material has the characteristics of high heat-conduction property and high heat resistance as well as excellent mechanical property, the high-heat-conducting polyphenylene sulfide material can be applied to structures and heat dissipation parts of electron devices such as LEDs (Light Emitting Diodes), LCD (Liquid Crystal Displays) and mobile phones.

The invention relates to a making method of piezoelectric composite materials. The making method of the piezoelectric composite materials comprises the following steps of bonding piezoelectric materials to a plate; cutting the piezoelectric materials bonded to the plate, wherein the depth of cutting cracks of the piezoelectric materials is less than the thickness of the piezoelectric materials; filling the cutting cracks of the piezoelectric materials with decoupling materials; using the plate as a standard, and grinding the upper surfaces of the solidified piezoelectric materials filled with the decoupling materials; then taking down the piezoelectric materials, and grinding the lower surfaces of the piezoelectric materials; and arranging electrodes on the surfaces of the ground piezoelectric materials, so as to obtain the piezoelectric composite materials. According to the making method disclosed by the invention, in the processing process, the situation that the piezoelectric materials are curved can be avoided, the right order and the regularity of the shape of microlite elements are effectively guaranteed, and reliable guarantee is provided for the consistency of plane array probes.

The invention concerns multi-carrier based digital telecommunication systems where the channel is used to transport several data streams according to the frequency division multiple access scheme. The proposed method concerns a mapping of data on physical resource in a transmission system where data of elementary streams is distributed over several physical resource blocks, and within each resource block in order to get data from a plurality of elementary streams on at least one sub-carrier and at least a symbol time of each physical resource block. This allows to achieve a good diversity of the allocation of the different streams, leading to the advantage, among others, that poor transmission conditions affecting a particular sub-carrier or a particular time duration, will not concentrate its effects on a particular stream.

The invention discloses a method for the surface regulation of a silicon material for solar cells. In the method, photoetching and mask film technology and alkaline wet-method corrosion technology are combined, a layer of mask film is deposited on the surface of silicon before the alkaline wet-method corrosion of the surface of the silicon, and the film layer on the surface of the silicon is patterned by a mask film pattern to make the corrosion of the surface of the silicon selectable and controllable. While performing the alkaline wet-method corrosion of the surface of the silicon to increase the light absorption area of the surface of the silicon, the method ensures the uniformity and regularity of the surface of the silicon. The method has the advantages of controllable operation, simplicity, easy implementation, high repeatability and easy large-scale production application.

The invention discloses an oil tea fruit shelling and screening processing method and equipment. The processing method and equipment are mainly used for fresh oil tea fruit shelling and oil tea seed shell screening. The processing method includes the following steps: (1) conveying fresh oil tea fruits to an oil tea fruit grading machine to grade; (2) respectively sending the fresh oil tea fruits to four sets of expanding shellers to perform shelling according to grades; (3) sending a seed shell mixture to a roller primary selection machine to perform primary screening; (4) performing fine screening through a needle roller fine selection machine; and (5) collecting and packaging the oil tea shells, and collecting and sending the oil tea seeds out. The equipment includes a feeding device, the grading machine, a transmission device, the expanding shellers, the roller primary selection machine and the needle roller fine selection machine. The processing method can overcome the technical disadvantages of complex processes, many processing equipment, low processing efficiency and low seed shell screening efficiency of existing oil tea fruit processing technologies; and the processing method is simple and reasonable in technology process, scientific in equipment structure, time-saving, energy-saving, high in production efficiency, good in cleaning effect and low in production cost, and can process the fresh oil tea fruits in batch.

The invention discloses a convolution kernel similarity pruning-based recurrent neural network model compression method and belongs to the technical field of computer electronic information. The method comprises the steps of: loading a pre-trained recurrent neural network model into a compressed recurrent neural network for training the pre-trained recurrent neural network model so as to obtain aweight matrix-initialized recurrent neural network model; calculating the L2 norms of each convolution kernel in the recurrent neural network model, sorting the L2 norms, and selecting convolution kernels in a norm pruning rate range and pruning the convolution kernels; and calculating the weight center of the convolution kernel of the pruned pre-trained recurrent neural network model, selecting convolution kernels in a similarity pruning rate P2 range and pruning the convolution kernels, performing gradient updating on a weight matrix corresponding to the convolution kernels, and pruning parameters in the updated weight matrix to obtain a compressed recurrent neural network model. According to the recurrent neural network model compression method provided by the invention, the large recurrent neural network model is effectively compressed while accuracy loss in a pruning process is reduced.

The invention relates to the technical field of air conditioners, in particular to a gas supplementing and enthalpy increasing pipeline system for an air conditioner. The gas supplementing and enthalpy increasing pipeline system for an air conditioner aims to solve the problem that the effect of a noise elimination and vibration reduction device of a gas supplementing and enthalpy increasing pipeline in an existing air conditioner is poor. Therefore, according to the gas supplementing and enthalpy increasing pipeline system, two noise elimination and vibration reduction device are arranged inwhich the cross-sectional area of the cylinder bodies are larger than the maximum cross-sectional area of the connecting pipe, so that the gas supplementing and enthalpy-increasing pipeline is provided with a plurality of pipelines with sudden cross-section mutation, the energy of most of fluid pulses in the gas supplementing and enthalpy increasing pipeline is consumed in the noise eliminating and vibration reducing device, so that the effect of the fluid pulse butting tube is reduced; the lengths of the barrel bodies of the two noise elimination and vibration damping devices are different, so that the passing frequencies of the two noise eliminating and vibration damping devices are staggered with each other so as to improve the frequency characteristics of the noise eliminating and vibration damping device, so that the noise elimination and vibration reduction effect is improved; a spray hole is formed in the connecting pipe of the cylinder body at the air outlet end of the cylinderbody, the energy of the fluid pulse is further consumed by the damping action of the spray hole so as to improve the noise elimination and vibration reduction effect.

The invention discloses a complementary circulating digging method for a floated pebble stratum large section tunnel. The digging method includes: using dug dregs at different parts to complement eachother; alternatively and circularly backfilling and stabilizing arc feet; canceling advance supports and system anchoring rods in a support system so as to reduce surrounding rock disturbance; adopting small-bore dual-layer reinforcing meshes; reinforcing a supporting and restraint function of foot locking anchoring rods for steel frames by increasing the group number of the self-propelled foot locking anchoring rods and reduce the length of the self-propelled foot locking anchoring rods; and using a monitoring system including deformation monitoring and foot locking anchoring rod axial forcemonitoring to master a safe state of surrounding rocks and a structure in real time from deformation and stress dual views. The digging method can fully consider the features of a floated pebble stratum, can reinforce a horizontal restraint effect of the support system on the surrounding rocks, can effectively reduce surrounding rock disturbance, can improve the construction efficiency, can savethe project cost, can ensure the safety of the structure and the stability of the surrounding rock in an early tunnel construction process.

The invention belongs to the field of fish breeding and particularly relates to a method for urging largemouth bass to spawn in advance. The method comprises the steps of: before September, selecting one-year old and / or two-years old bass as parents, and stocking 1000-1300 groups of the parents of 0.5-0.7 kg per mu in a breeding pond; feeding an expanded feed every day, wherein an expanded feed gathering device is arranged in the breeding pond; from September to November, feeding the parent fishes with iced fresh fishes, and when the temperature is lower than 15 DEG C, selecting the parents and putting the parents in a transparent heat-preserving greenhouse for intensified breeding, and starting microporous oxygenating equipment, flushing a spawning pond with water, and in the last ten days of March, placing an artificial spawning nest in the spawning pond. By virtue of the method provided by the invention, under the condition that the largemouth bass needs not to be artificially induced to spawn and artificially inseminated, a purpose of natural spawning and natural insemination can be achieved by controlling conditions such as water quality, nutrition and temperature. Each operation in the method plays a critical role of urging largemouth bass to spawn in advance.

The invention discloses an automatic sectional material storage device, comprising a main frame body, wherein the main frame body is provided with a storage mechanism for storing sectional materials, the storage mechanism comprises clapboards arranged on the main frame body at interval, at least one clapboard can be used for adjusting a spacing, and the space between two adjacent clapboards is a storage slot for storing the sectional materials; the main frame body is provided with conveying mechanisms corresponding to the storage slots respectively, and the conveying mechanisms are used for conveying the sectional materials to the storage slots; the main frame body is further provided with a control mechanism consisting of a main controller and a plurality of sensors for detecting the sectional materials, the main controller is connected with the sensors and the conveying mechanisms respectively, and the sensors acquire the position information of the sectional materials and then transmit the position information to the main controller so as to control the starting or stopping of the conveying mechanism; and the storage slots are internally provided with auxiliary conveying mechanisms and / or overturn prevention mechanisms, the auxiliary conveying mechanism are used for assisting the forward conveying of the sectional materials, and the overturn prevention mechanisms are used for preventing the sectional materials from overturning. The automatic sectional material storage device disclosed by the invention can be used for storing the sectional materials automatically and ensuring continuous and stable feeding for a next procedure, and is high in production efficiency and low in labor intensity.

The invention relates to a polylactic acid block copolymer, which solves the problems that current method is hard to prepare the polylactic acid block copolymer with high-melting point polyester. The polylactic acid block copolymer is a two-block copolymer which is shown as A-b-B, wherein A is a single-end hydroxyl aromatic polyester block, and B is a polylactic acid block. The polylactic acid block is one or more of a poly-L-lactic acid block, a poly-D-lactic acid block and a poly-DL lactic acid block. The polylactic acid block copolymer is prepared by the following step of: adopting an organic solvent which can dissolve reactants of single-end hydroxyl aromatic polyester and lactide to be a reaction medium, tin salt as a catalyst, and the single-end hydroxyl aromatic polyester as an initiator to initiate the ring opening polymerization of lactide. With the adoption of the polylactic acid block copolymer, the polymerizing temperature can be controlled to reach a scope in which polylactic acid and lactide cannot be degraded, and the racemization cannot be carried out, so that the generation of transesterification can be effectively inhibited, the regularity of the chain section can be ensured, and the block copolymers of polyester and the polylactic acid can be successfully prepared, including aromatic polyester with the high-melting point.

The invention provides a mobile luggage carrying device for air transportation, which comprises a lighting switch and a battery; The vehicle body is of a hollow structure, and seven storage openings are arranged on the left end face of the vehicle body, and seven unloading openings are arranged on the right end face of the vehicle body; 7 loc holes are arrange at that bottom of the end face of theright end of the vehicle body, and one end of the handle is inserted into the inside of the locking hole; The wheels are arranged in two groups, and the wheels are respectively arranged at the frontand rear ends of the bottom ends of the vehicle body; A load plate is arrange inside that vehicle body, and ten supporting shaft are distributed on the top end face of the load plate; The ball is arranged on the support shaft, and the top of the ball is higher than the top end face of the bearing plate; 7 door are arranged in total, and that door is arrange on the right end face of the vehicle body, and the handle is rotatably connected with the bottom of the vehicle door; The invention is advantageous in partitioning the luggage boxes stored in the device, separating the luggage boxes in thedevice from each other, ensuring the regularity between the luggage boxes, and facilitating the post-unloading operation of the personnel.

The invention belongs to the technical field of nuclear power design, and specifically relates to a functional analysis method for water-supply control of a vapor generator plant by using a digital man-machine interface in a nuclear power. According to the invention, through demand analysis and functional analysis for normal and accident operation, the method abstracts and sorts out a main control functional module contained by the control function of the vapor generator, and reasonably and effectively organizes and integrates monitoring and control information needed for main operation steps in the main control functional module, thereby developing the digital man-machine interface used for water-supply control of the vapor generator in a pressurized water reactor nuclear power plant; thus, operators are convenient to rapidly and accurately obtain the state and the upstream and downstream conditions of operated or monitored equipment and parameters; execution efficiency is improved; human errors are reduced; and the burden of the operators is relieved.

The invention provides a preparation method of polyaniline. The preparation method comprises the following steps: mixing aniline with an organic solvent to obtain a first mixed solution; mixing an inorganic acid aqueous solution with an oxidizing agent, namely potassium ferricyanide, to obtain a second mixed solution; and mixing the first mixed solution with the second mixed solution for reaction to obtain polyaniline. Due to the adoption of the potassium ferricyanide oxidizing agent with low oxidation reduction potential as well as interfacial polymerization, the prepared polyaniline is regular in structure and low in molecular weight, thereby having high solubility. Experiment results show that the polyaniline prepared by the preparation method can be completely solved in polar solvents N-methyl pyrrolidinone, dimethylacetamide and dimethyl sulfoxide, as well as in common solvents tetrahydrofuran and ethanol.

The invention discloses a dustproof paper shredding device. The dustproof paper shredding device comprises a machine body and a machine cover connected to the machine body. A paper inlet is formed in the side wall of the machine body. The machine cover comprises a concertina fold cover body and a control cover body. The control cover body is formed by fixedly connecting a swing plate and a baffle end to end, an included angle is formed between the swing plate and the baffle, the joint of the swing plate and the baffle is hinged to the machine body, and the paper inlet is covered with the baffle. One side of the concertina fold cover body is connected to the machine body, the other end of the concertina fold cover body is hinged to the swing plate, and a button is installed above the hinge position of the swing plate and the concertina fold cover body; and a fixed plate is fixedly connected to the position, parallel to the portion under the hinge position of the swing plate and the concertina fold cover body, of the machine body, the hinge position of the fixed plate and the concertina fold cover body and the hinge position of the swing plate and the concertina fold cover body are connected through compression springs, and the fixed plate is further provided with magnetic parts for attracting the machine cover. By means of the technical scheme, the problems that a paper inlet of an existing paper shredding device is open, consequently, impurities easily enter the paper shredding device, and the paper shredding device frequently breaks down are solved.

The present disclosure relates to a test performance prediction method of a test system. The invention relates to a device, a medium and an electronic device, belonging to the technical field of machine learning application. The method comprises the following steps of: climbing the data of a plurality of target indexes before a predetermined time point in turn, inputting the data into a data analysis system to carry out real-time test on the data analysis system, and sequentially outputting the test results; serially connecting the sequentially outputted test results to obtain a test result sequence; inputting the test result sequence into a pre-trained machine learning model, outputting a fluctuation curve with a time point as an abscissa after the predetermined time point by the machinelearning model, and predicting the test result data as a ordinate. According to the preset performance analysis method, the fluctuation curve is analyzed to obtain the test performance result of the test system. The present disclosure utilizes the test result sequence sample iterative training prediction machine learning model to accurately and efficiently implement the test performance predictionof the test system.