36results about How to "Reduce total time" patented technology

The invention relates to the technical field of computer-aided engineering, in particular to a nonlinear efficient iterative solving method for thermal strain load, which is used for solving an obtained finite element equation by using a modified Newton-Raphson method and comprises the following steps of: firstly, establishing a geometric model to be analyzed and performing grid division; the method comprises the following steps: firstly, setting a model to be analyzed, then setting boundary conditions and temperature field change conditions of the model to be analyzed, finally, inputting the conditions into an algorithm solver, solving a nonlinear equation set, iteratively inputting a load continuously according to a modified Newton-Raphson method in the solving process, calculating node displacement until convergence, and solving stress-strain conditions in the welding process according to a material constitutive relation. In the solving process, by judging the size of the two norms of the displacement increment obtained in the adjacent increment step heuristic stage, the convergence of nonlinear solving of the structure is enhanced through the calculation mode, and the solving speed of the nonlinear problem in the thermal elastic-plastic constitutive structure is increased.

The invention relates to the technical field of robots, and provides a Robomaster multi-sensor fusion decision-making-based sentry robot which comprises a chassis, a holder, an actuator module, a sensing module, a lower computer and an upper computer. The lower computer comprises a receiving module, a decision module, a distribution module and a motion control module; the upper computer comprises a laser radar navigation module and an image recognition processing module; the decision-making module is used for performing corresponding processing on the received data fusion robot according to the situation faced by the robot; and the distribution module is used for directly sending the received sensing data of the sensing module and the data of the judgment system to the laser radar navigation module and the image recognition processing module. According to the scheme, through multi-sensor fusion and a low-computing-power control system, a complex environment can be sensed more comprehensively, low-delay image processing and path planning are achieved, multiple independent and mutually decoupled modules are integrated, and high expansibility and stability are achieved.

The invention discloses a thin-wall three-period minimal curved surface lattice structure laser additive manufacturing method, which relates to the field of additive manufacturing, and comprises the following steps: (1) according to a three-period minimal curved surface implicit function and additive manufacturing layer thickness, obtaining a single-channel contour path of each layer through direct slicing; (2) generating parallel filling lines in each layer, and intersecting the parallel filling lines with the combination of the contour paths of the layer and the higher layer; (3) combining every two intersection points to form a line segment, and taking the line segment as a filling path if sampling points of the line segment meet the conditions of a functional expression, an inclination angle and a length; (4) taking the filling path of the layer as a supporting layer, and moving the filling path upwards by one layer to form a filling layer; and (5) all the paths are input into additive manufacturing equipment, and different machining parameters are set for manufacturing. The laser path of the thin-wall three-period minimal curved surface lattice structure can be efficiently generated, only one melting channel is contained in the thickness direction of the structure, the wall thickness is smaller than 200 micrometers, and the cavity defect generated in the slicing process can be overcome.

The invention discloses a metal plate defect imaging method based on laser ultrasound and surface wave number filtering analysis, and aims to position defect positions and invert defect shapes by using metal plate surface wave echoes. The position of detection light of a laser vibration meter is determined on the surface of a fixed metal plate, and multiple groups of ultrasonic data are obtained by performing field scanning on the surface of the same side of the metal plate through a field scanning system. Performing wavelet transform on the obtained surface wave data to remove a low-frequency component in the signal, and performing Fourier transform on a time component to obtain a frequency spectrum; and then extracting signal data of a specific frequency and carrying out two-dimensional Fourier transform to obtain a wave number spectrum. And finally, filtering and inverse Fourier transform are carried out on the wave number spectrum to obtain a defect image, and defect positioning and defect shape imaging are realized.

The invention discloses a pavement water damage and anti-permeability performance simulation test device, and belongs to the field of pavement performance test. A pavement water damage and anti-permeability performance simulation test device comprises a test board, the top of the test board is fixedly connected with a mounting rack, the top of the test board is provided with a liquid collecting tank, the test device further comprises a reciprocating screw rod, the reciprocating screw rod is rotatably connected between the inner walls of the two sides of the mounting rack, and the reciprocating screw rod is sleeved with a moving plate in a threaded mode. The top of the moving plate and the bottom of the mounting frame slide in an attached mode, the bottom of the moving plate is provided with a rolling part and a spraying assembly, the rolling part is used for conducting pressure simulation on the road surface, and the spraying assembly is arranged on the mounting frame and used for conducting a water flow scouring simulation test on the road surface; through the arrangement of the rolling roller, the vibration plate, the water spraying box and other structures, rolling, water spraying and vibration effects are generated on the surface of the pavement sample, so that the real pavement condition is simulated, and the accuracy of the test result is improved.

The utility model discloses a double eccentric arc surface processing and polishing device of a contact type backstop, which relates to the technical field of processing and polishing devices and comprises a working base station, two longitudinal positioning plates are mounted on the working base station along the length direction of the working base station, two transverse sliding frames are arranged on the working base station along the width direction of the working base station, and polishing rolling shafts are arranged in the transverse sliding frames. Workpiece bodies are arranged between the two longitudinal positioning plates, the length of the polishing rolling shaft is matched with the length of the workpiece bodies, and eccentric blocks are arranged between the longitudinal positioning plates and the workpiece bodies. Aiming at the grinding process of the special-shaped wedge block in the contact type backstop, the whole process only comprises a single rotating process, the rotating center of the special-shaped wedge block takes one circle center point in the special-shaped wedge block as a rotating point, and then the two groups of grinding rolling shafts are matched with the rotating process in a motion form; the method specifically comprises a static linear motion mode and a dynamic linear motion mode, and aims to simplify the polishing process and shorten the consumed time in the single polishing process.

The invention relates to the technical field of electric power inspection and maintenance robot control, and discloses a power transmission line crawling robot lifting self-adaptive shake suppression control method and system. The method comprises the following steps: acquiring three-axis acceleration and three-axis angular velocity data of a robot platform, calculating a yaw angle and an angular velocity of the robot platform relative to a vertical balance position, and constructing an evaluation index representing the shaking strength of the platform; according to the shake strength evaluation index, driving parameters of a lifting motor are dynamically adjusted through a nonlinear mapping relation; and the swing period and phase of the robot platform are monitored, and when the platform swings to a specific phase point, an instantaneous driving pulse is applied to a lifting motor to consume swing energy. By means of the method, the maximum swing angle of the robot platform can be reduced by 60% or above, the static time after the robot platform reaches the target position is shortened by 70% or above, and the working efficiency is remarkably improved.

This invention provides a conflict-aware transactional reconstruction method and apparatus for vehicular networks, belonging to the field of vehicular network configuration and scheduling control technology. It solves problems such as multi-node time slot conflicts, cross-device submission asynchrony, and inability to quickly roll back after update failures in existing vehicular network transactional reconstruction processes. The method includes: upon receiving a reconstruction request, generating a set of scheduling update operations based on the reconstruction request and the latest scheduling status table of each device node in the vehicular network; establishing a conflict graph and a dependency graph based on the scheduling update operation set; determining a set of transaction execution layers and the corresponding hierarchical execution sets for each transaction execution layer based on the conflict graph and dependency graph; and performing transactional reconstruction on each device node based on the set of transaction execution layers and the corresponding hierarchical execution sets, including differential patch pre-writing, atomic pointer switching triggered by a unified timestamp, and distributed consistency monitoring.

The invention discloses a portable car coupler reconnection simulation test device and a control method, a main control module in the device is internally provided with control logic in a test process, and the main control module comprises a priority hierarchical scheduling mechanism, a dual mutual exclusion lock mechanism and a state real-time synchronization mechanism. The control method comprises the following steps: configuring a GPIO (General Purpose Input / Output) interface, UART communication and a mutual exclusion lock of the main control module; triggering an operation instruction based on the instruction interaction module, and performing priority division on the triggered operation instruction; based on the double interlocking safety state, performing mutual exclusion judgment on an operation instruction being executed; constructing a real state mirror image, and synchronously updating the physical control point and the virtual control point which are subjected to state change; input acquisition and output control of reconnection train level signals are executed based on the acquisition output module, and state information display is synchronously performed on the HMI serial port screen module. The device is portable, easy to use and low in operation threshold, and the efficient and safe debugging requirements of the rail transit vehicle are comprehensively met.

This invention discloses Ni2Fe(SO4) 0.5 (OH)6(H2O) 3.85 This paper discusses / NF catalysts, their preparation methods, and applications, belonging to the field of catalyst synthesis technology. Using large-size nickel foam as a substrate, Ni₂Fe(SO₄) is directly prepared through one-step in-situ microwave-driven growth. 0.5 (OH)6(H2O) 3.85 The nanosheet array eliminates the need for subsequent loading or additional processing, simplifying the process and enhancing the bond between the catalyst and the substrate. This catalyst exhibits excellent performance in hydrogen production via water electrolysis, particularly in seawater electrolysis.

The application provides a steel structure calculation scheduling method and system based on dependency coding, and relates to the technical field of building engineering structure calculation and information processing. The calc_dependency and knowledge_code fields are extended on the basis of the standard MCP protocol, which are used for coding the data dependency, state dependency and trigger dependency relationship between calculation functions, and binding the corresponding specification clauses. The dependency relationship is analyzed to construct a directed acyclic graph, the dynamic priority combining in-degree and depth is calculated, the nodes without dependency are executed in parallel, the nodes with dependency are executed in series and the data is transmitted. The calculation results are checked in two dimensions through the specification review and logical consistency review driven by the knowledge base, and when the check fails, the feedback correction mechanism is formed by automatically searching for correction suggestions. Through the Prompt engineering injection protocol rule, the LLM can generate standard messages without retraining, and the automatic scheduling and compliance guarantee of the steel structure multi-function collaborative calculation are realized.

This invention belongs to the field of structural optimization design, and specifically discloses a topology optimization method and system for accurately and efficiently controlling structural deformation characteristics. The method includes: performing finite element mesh generation on the structure to be optimized, which exhibits spring deformation characteristics, and defining design variables corresponding to the mesh; determining the total strain energy constraint of the structure based on the spring constant and maximum deformation, and establishing a first topology optimization model with the goal of minimizing the total structural volume; performing topology optimization based on the first topology optimization model to obtain the structural configuration and its total volume; setting an upper limit for the total structural volume constraint based on this total volume to construct the total structural volume constraint, while simultaneously using the total strain energy constraint of the first topology optimization model, and establishing a second topology optimization model with the goal of minimizing the p-norm of the local deformation error under external force; and performing topology optimization based on the second topology optimization model to obtain the final structural configuration. This invention is highly versatile, functionally diverse, and precise and efficient.

The utility model discloses a batch test tool for testing the performance of an angular displacement sensor, which comprises supporting columns, a driving seat, a driving motor, a driving gear, a driven gear, a mounting plate and a compression bolt, the driving seat is mounted at the upper parts of a plurality of supporting columns, and a shaft of the driving motor is connected with the driving gear through a shaft sleeve; the multiple driven gears are connected with the multiple connecting shafts respectively, the shaft sleeve and the connecting shafts are connected with the driving base through bearings respectively, the multiple driven gears are connected with the driving gear in a meshed mode respectively, positioning holes are formed in the middles of the upper faces of the driven gears, multiple installation sinking grooves are formed in the upper face of the installation plate, and sinking groove through holes are formed in the middles of the bottoms of the installation sinking grooves. The plurality of sinking groove through holes are respectively positioned above the plurality of positioning holes, and the plurality of compression bolts are respectively mounted on the mounting plate. According to the utility model, the rotating shafts of a plurality of angular displacement sensors are driven to rotate at a time so as to realize batch testing, the testing efficiency is improved, and the testing cost is reduced.

This application discloses a method for dispensing samples and reagents, comprising: controlling a first element to perform a sample dispensing action, dispensing a sample to be tested into a reaction vessel, the sample dispensing action including at least a sample input action and a sample output action; while controlling the first element to perform the sample dispensing action, controlling a second element to perform a reagent dispensing action, dispensing a detection reagent into the reaction vessel, the reagent dispensing action including at least a reagent input action and a reagent output action; wherein the sample output action and the reagent output action are executed asynchronously. This method achieves parallel dispensing of samples and reagents, shortens the time consumed in the sample / reagent dispensing stage during sample detection, and improves the operating efficiency and sample detection speed of automated sample dispensing equipment.

This application discloses an application installation method and apparatus, belonging to the field of computer technology. The application installation method includes: receiving an installation instruction for a target application; responding to the installation instruction, receiving a first data stream sent by a server and creating a first session; writing the first data stream to a target directory according to the first session; and installing the target application after all its installation files have been written to the target directory; wherein the first data stream is the data stream corresponding to the installation files; the first session includes write permissions to the target directory; and the target directory is located in the internal storage space of a target electronic device.

The invention discloses a self-drilling anchor rod capable of achieving double-rotation-direction drilling and a manufacturing process thereof.The self-drilling anchor rod comprises an anchor rod body, and double-rotation-direction threaded sections are arranged at the two ends of the anchor rod body correspondingly; the right-handed threads rotate clockwise along the whole periphery of the two ends of the anchor rod body, the left-handed threads rotate anticlockwise along the whole periphery of the two ends of the anchor rod body, and the right-handed threads and the left-handed threads are machined independently, so that the right-handed threads and the left-handed threads are mutually crossed and overlapped. According to the self-drilling anchor rod, the large-diameter anchor rod and the small-diameter anchor rod can meet the adaptation of anchoring drilling machines with different thread rotating directions without distinguishing left-hand threads and right-hand threads, the universality of the self-drilling anchor rod is achieved, stock management of factories is facilitated, the delivery date of products is shortened, in addition, the self-drilling anchor rod meets the fastening performance of assembly connection, and the service life of the self-drilling anchor rod is prolonged. The stress can be uniformly dispersed and well transmitted, and the anchoring strength can be effectively improved.

The application relates to a distributed optical fiber sensing system and discloses a fast measurement BOTDA sensing device based on chaotic light polarization orthogonal detection, which comprises a narrow-line-width laser; signals output by the narrow-line-width laser are divided into two paths: one path is used as injection light to enter a chaotic light generation module to make the module output chaotic light with a wide spectrum, the chaotic light is used as detection light and sequentially connected with one end of a sensing optical fiber after passing through an optical isolator, an electro-optic modulator, a polarization maintaining optical fiber and an erbium-doped fiber amplifier; the other path is used as pump light and sequentially connected with the other end of the sensing optical fiber after passing through a semiconductor optical amplifier and a first circulator; after polarization orthogonal detection light is transmitted to the other end of the sensing optical fiber, the polarization orthogonal detection light is output through a first circulator output end and is coherently detected and data processed by a coherent detection module to obtain a Brillouin gain spectrum of the sensing optical fiber along a line. The application can realize Brillouin gain sweep-free measurement and improve the measurement speed.

The invention relates to an equipment connection method and device, electronic equipment and a storage medium. The device connection method is applied to a first device, and comprises: when the state of a wireless network card satisfies a preset condition, creating a first network card, the first network card being used for establishing a point-to-point wireless connection channel between the first device and a second device; sending a point-to-point wireless connection request to a second device, or receiving a point-to-point wireless connection request sent by the second device; creating a device identity, wherein the device identity is a group owner identity or a group client identity; and based on the point-to-point wireless connection channel, establishing a communication connection with the second device by using the device identity. According to the method, the time consumed for establishing the network card can be saved, so that the total time consumed for establishing the WiFi P2P connection is reduced, the waiting time required by the P2P wireless connection is effectively shortened, and the user experience is improved.

The invention discloses a binocular rendering method and device, head-mounted display equipment and a readable storage medium, and relates to the technical field of head-mounted display equipment, the binocular rendering method is applied to a graphics processor, and the binocular rendering method comprises the following steps: obtaining geometric data of a to-be-rendered three-dimensional model, and obtaining a left-eye view matrix and a right-eye view matrix of the head-mounted display equipment; storing the left-eye view matrix and the right-eye view matrix into a preset view matrix array to obtain a target view matrix array; performing image rendering on the to-be-rendered three-dimensional model according to the geometric data and the target view matrix array to obtain a left eye texture image and a right eye texture image; and writing the left-eye texture image and the right-eye texture image into a texture image array of the head-mounted display equipment so as to respectively display the left-eye texture image and the right-eye texture image on a left-eye screen and a right-eye screen of the head-mounted display equipment. According to the invention, the rendering duration of binocular rendering can be shortened, so that the rendering efficiency of binocular rendering is improved.

The invention provides a rapid dyeing method of a dark gray polyester-cotton knitted fabric, which comprises the following steps: (1) pre-treating the polyester-cotton knitted fabric, then carrying out polyester dyeing on the polyester-cotton knitted fabric by adopting a polyester dyeing solution, carrying out primary drainage, and then sequentially carrying out reduction cleaning and secondary drainage to obtain a semi-dyed knitted fabric; the polyester dyeing liquid comprises a dispersing and leveling agent TF213; and (2) carrying out cotton dyeing on the semi-dyed knitted fabric obtained in the step (1) by adopting a cotton dyeing solution, and then carrying out cotton post-treatment to obtain the dark gray polyester-cotton knitted fabric. The total consumed time in the dyeing process is greatly shortened through the specific dispersing and leveling agent, and the color stability and fastness of the obtained dark gray polyester-cotton knitted fabric are equivalent to those of a traditional dyeing process.

The invention discloses an automatic testing device, system and method for software upgrading of a commercial vehicle, and relates to the field of simulation testing, and the device comprises a tested controller, a T-BOX, a vehicle machine, and a power supply module. The power supply module supplies power to the tested controller, the T-BOX and the vehicle machine; the tested controller, the T-BOX and the vehicle machine CAN are in communication connection; the vehicle machine outputs video data; based on the tested controller, the T-BOX and the vehicle machine CAN communication connection and the vehicle machine output video data, constructing simulation of the hardware environment of the commercial vehicle; and generating a data monitoring port for vehicle software upgrading based on the simulation of the hardware environment of the commercial vehicle. The commercial vehicle software upgrade automatic test system is used for rack test. Wherein the automatic upgrade task issuing module is used for issuing an upgrade task to the software upgrade test platform; the message sending module is used for simulating and sending real vehicle related messages; the man-machine interaction module is used for simulating a user to confirm upgrading operation; and the software upgrading monitoring module is used for monitoring the upgrading progress in real time and recording test data.

The invention discloses a device upgrading method and device, a to-be-upgraded device and a storage medium, the device upgrading method can be applied to the technical field of device upgrading, and the method comprises the following steps: in a starting process of the to-be-upgraded device, based on an initialized network driver of the to-be-upgraded device, detecting whether a specified service host corresponding to the to-be-upgraded device is reachable; the specified service host is located in a private local area network physically isolated from the wide area network; if it is detected that the specified service host is reachable, network connection irrelevant to the specified service host on the to-be-upgraded equipment is cut off, so that exclusive network connection from the to-be-upgraded equipment to the specified service host is established; obtaining upgrade data from the specified service host through exclusive network connection; and based on the upgrade data, executing the upgrade of the to-be-upgraded device. The risk that data are tampered or implanted in the transmission process is completely eradicated, the total consumed time of a single device from power-on to ready is shortened, and time saving of the single device is converted into remarkable improvement of the overall production line throughput.

The invention discloses a hot-rolled coil warehouse mechanical ventilation cooling method which comprises the following steps: S1) a basement is excavated and arranged below a hot-rolled coil warehouse workshop, the basement is used as an underground ventilation interlayer, and a primary fan is arranged at the end part of the underground ventilation interlayer; s2, an air inlet shutter is arranged on the workshop wall of the hot-rolled coil warehouse, outdoor air enters an air inlet small chamber for containing and buffering the air volume through the air inlet shutter, and then the outdoor air is fed into the underground ventilation interlayer through a first-stage draught fan; and (S3) the air in the underground ventilation interlayer is fed into the hot-rolled coils in the hot-rolled coil warehouse workshop through a second-stage fan, and the hot-rolled coils are subjected to ventilation cooling. The underground ventilation interlayer is arranged below the hot-rolled coil warehouse workshop, outdoor air is introduced into the underground ventilation interlayer through the first-stage fan, and then the air in the underground ventilation interlayer is blown to the surface of a hot-rolled coil through the second-stage fan for air cooling, so that the temperature of the hot-rolled coil can be quickly reduced, and the cooling efficiency is improved; and the overall working efficiency is also improved, and the delivery date of an enterprise is shortened.

The invention belongs to the technical field of molecular detection of biological medicines, and particularly relates to a nucleic acid extraction-free SFTSV detection kit, primer probes and a method. The primer probe composition comprises an upstream primer SEQ ID NO: 1 for specifically recognizing the SFTSV, a downstream primer SEQ ID NO: 2 of which the 5'end is labeled with biotin, and a probe SEQ ID NO: 3 of which the 5 'end is labeled with a reporter group and contains THF modification. The kit comprises the composition, a nucleic acid releasing agent and a lateral flow chromatography test strip. The method comprises the following steps: treating a serum / plasma sample by using a nucleic acid releasing agent, carrying out RPA isothermal amplification by directly taking a lysate as a template, and detecting a result through a test strip. The RPA-LFD rapid detection of the SFTSV is realized, the sensitivity (200copies / mL) and the specificity are high, the operation is simple, convenient and rapid (about 40 minutes), a complex instrument and a nucleic acid extraction step are not needed, and the method is suitable for base-level field screening.

The application relates to the technical field of automatic beverage preparation, and particularly discloses an automatic beverage formula preparation and filling equipment. The equipment comprises a master control device, a plurality of slave control devices, a bus communication module, a filling execution mechanism and a man-machine interaction device. The master control device is used for analyzing a beverage formula and issuing a control instruction, the slave control device is used for receiving the instruction and driving a stepping motor to act, and the stepping motor drives a needle cylinder syringe to complete quantitative injection of raw materials. The equipment adopts a modular design, supports parallel control of the plurality of slave control devices, and can accurately and efficiently complete automatic formula preparation of beverage raw materials. The application has the advantages of reasonable structure, stable communication, strong expansibility, and can significantly improve beverage preparation efficiency and consistency.

A method for producing an atmospheric corrosion resistant steel plate, wherein the weight percentage of the steel is C=0.03%~0.08%, Si≤0.60%, Mn=0.50%~1.50%, P≤0.025%, S≤0.005%, Al=0.01%~0.06%, Cu=0.30%~0.60%, Ni=0.30%~1.0%, Cr=0.30%~0.60%, Mo≤0.50%, and one or more of Ti≤0.03%, Nb≤0.10%, and V≤0.10% can be added, and the balance is Fe and inevitable impurity elements. A layer of dense and uniform iron oxide scale with extremely strong adhesion can be obtained by adopting heating, rolling, cooling and finishing processes, which can play the role of "stopping rust with rust" and improve the atmospheric corrosion resistance of the steel plate. At the same time, due to the simple process, no need for heat treatment and rust layer stabilization treatment, etc., the delivery time of steel plates is greatly shortened, the production cost is reduced, and it is a green production method.

A kind of preparation method of drawing die for red copper rectangular tube production, specific preparation method is as follows: using the designed die parameter to prepare die blank, line cutting cavity sizing band and deformation zone, after line cutting, stress annealing is carried out by electric furnace, annealing temperature is 380 DEG C-390 DEG C, the furnace temperature holding time of die is not less than 3-3.5 hours, after annealing to room temperature, grind inner and outer R angle, adopt multiple finished product trial drawing, the inner size of die is ground and shaped according to the outer size of trial drawing pipe, after polishing, the finished product is obtained.The die form used in the application is innovative in material selection and die structure, compared with the die used in traditional process, the core head is saved, the die manufacturing cost is reduced by 50%, the die manufacturing time and product delivery period are greatly shortened, and the inner surface defects of rectangular pipe are obviously reduced.

The invention discloses a high-frame-frequency scheduling synchronization method and system for a multi-channel infrared digital prototype, and belongs to the technical field of infrared imaging simulation and digital prototypes, and the method comprises the steps: carrying out the decoupling of data preprocessing and core calculation in a producer-consumer mode; efficient zero-copy data transmission from a host to a GPU is realized by utilizing a page locking memory and a DMA (Direct Memory Access) technology, and page table switching overhead of a non-real-time operating system is avoided; geometric imaging and sparse point spread function calculation are executed in parallel at the GPU end; and finally, realizing lock-free output and multi-channel frame synchronization of the image data through a double-buffer read-write separation mechanism. The method can effectively solve the problem that multi-channel frame numbers are not aligned due to thread scheduling jitter, IO blocking and CPU calculation overload under a traditional CPU architecture, the full-link delay is remarkably reduced, and real-time stable operation of a multi-channel infrared digital prototype at the high frame frequency of 100 Hz and above is achieved.

A method for removing a low-dielectric-constant material layer includes: providing a wafer to be cleaned, the surface of which has a low-dielectric-constant material layer; dry etching the wafer using oxygen plasma to reduce the methyl content in the low-dielectric-constant material layer; performing a first isotropic etching on the wafer for a first duration using an etching solution of a first concentration; and performing a second isotropic etching on the wafer for a second duration using the etching solution of a second concentration; wherein the second concentration is less than the first concentration, and the second duration is less than the first duration. This method can quickly and effectively remove the low-dielectric-constant material layer from the wafer surface and significantly reduce the number of particles on the cleaned wafer surface, making the wafer suitable for reuse, thereby improving efficiency and reducing costs.

The present invention relates to the field of distributed processing technology, and in particular to a method for constructing a hadoop parameter optimization model, comprising: using a server to collect the amount of data generated by each data source within a certain period of time; analyzing the characteristics of a single data source, and assigning a characteristic value in proportion to the amount of data generated by the data source, and using the server to estimate the size of a file to be processed according to the characteristic value; the server collects the resource inventory of each preparation node in a normal operating state in a certain period of time, and groups them; the server estimates the number of nodes and processing time according to the size of the file to be processed; the server adjusts the parameters of hadoop according to the server's estimated number of nodes and processing time. By analyzing the characteristics of the data source, assigning a characteristic value, estimating the file size according to the characteristic value, grouping the hadoop distributed nodes, and adjusting the parameters of hadoop according to the file size and the node group, the resources of the hadoop project are saved.