35results about How to "Reduce interference" patented technology

The invention discloses a time interference double-target electrical stimulation system, which comprises a signal generation unit used for generating multiple paths of carrier signals and adjusting the frequency, amplitude and / or phase of the carrier signals; the current output unit is used for converting the multiple paths of carrier signals into multiple paths of carrier currents, and electrical isolation and intermodulation suppression are provided between the multiple paths of carrier currents; the electrode unit is electrically connected with the current output unit and comprises a plurality of electrodes and a position subunit, the plurality of electrodes are used for receiving the multi-channel carrier current so as to discharge in an attached target area, and the position subunit is used for determining the attaching position of each electrode; and the control unit is used for controlling the discharge of the plurality of electrodes, detecting the impedance and carrier current at the plurality of electrodes to assist the position subunit in determining the fitting position and detecting the frequency and / or phase of the plurality of carrier current to control the signal generation unit to adjust the frequency and / or phase of each path of carrier signal. The system realizes independent stimulation of two target spots in a hardware-level time interference mode, has signal output with high stability and low mutual interference, and can perform real-time feedback regulation and safety protection.

The invention relates to the field of seed selection, in particular to a seed selection method and system based on machine vision, and the method comprises the steps: obtaining a gray image of a seed, extracting a seed region in the gray image, the seed region comprising a plurality of first sub-regions, and selecting any pixel point in the first sub-regions as a seed point; edge detection is carried out on the grayscale image to obtain a plurality of edge lines, an internal characteristic value and an initial edge characteristic value of each pixel point on the edge lines are calculated, the initial characteristic value is in negative correlation with the internal characteristic value, and the initial edge characteristic value is updated to obtain an optimal edge characteristic value; according to the optimal edge feature value of each pixel point on the edge line, utilizing a watershed algorithm to segment the grayscale image to obtain a segmented image; and inputting the segmented image into the detection model to obtain the quality grade of the seed. According to the method, the over-segmentation phenomenon can be avoided in the segmentation process, and the working efficiency and accuracy of seed selection are improved.

The invention discloses a tool path planning method and system for numerical control machining of a face gear, belongs to the technical field of gear machining, and solves the problems that multiple sets of tool interference and path optimization constraints are not considered and introduced in an existing method, and frequent pause and adjustment are caused in the machining process due to unreasonable tool interference and paths. The method comprises the steps of determining a machining mode of a to-be-machined gear based on parameters of the to-be-machined gear, detecting and adjusting an interference path of a milling cutter, outputting a primary adjustment path after primary adjustment, adjusting the milling posture of the milling cutter, and outputting a secondary adjustment path after secondary adjustment. According to the method, the initial machining path of the milling cutter in the multi-head cutter set is determined through a path calculation algorithm, and the optimal path without interference of the milling cutter is obtained. The milling precision of the milling cutter is guaranteed, collision or interference among multiple groups of milling cutters during machining is avoided, and the efficiency of the milling cutter is improved.

The embodiment of the application provides an insulating film and a battery cell, and belongs to the technical field of battery manufacturing. The insulating film comprises: an insulating film body; a crease line group, the crease line group is arranged at intervals on the insulating film body and is at least two, each crease line group comprises at least two parallel and spaced crease lines; the insulating film body is configured to be bent along the crease line, so as to form a transition part corresponding to the crease line group, and the transition part is arranged between the edge of the battery cell and the fillet of the shell. After the insulating film is bent along the crease line, the sharpness of the bending part is low, the possibility of interference or sliding between the bending part of the insulating film and the fillet structure of the shell is reduced, and the insulating film is more easily loaded into the shell.

The present invention discloses a low-emission swirl burner for a gas turbine and an operating method thereof. The burner comprises a hollow inner cone and an outer cone which are coaxially arranged. A plurality of swirl blades are arranged between the inner cone and the outer cone. A plurality of inner cone fuel spray hole channels penetrating the inner cone wall are arranged on the inner cone wall. An annular blade fuel spray hole channel is also arranged on the inner cone wall. A plurality of blade fuel spray holes are arranged on each swirl blade, and each blade fuel spray hole is connected to the blade fuel spray hole channel. An air channel is formed in the cavity between the inner cone and the outer cone. The fuel nozzle of the burner is designed in two stages. The first stage is the inner cone fuel spray hole channel on the inner cone wall of the burner. When the load is low, the fuel is sprayed out from the inner cavity of the inner cone through the plurality of inner cone fuel spray hole channels, which can stabilize the flame and control the emission. The other stage is the blade fuel spray hole on the swirl blade. When the load is high, the fuel is sprayed through the blade fuel spray hole, mixed with the air and burned under the action of strong swirl, which can reduce the emission of NOx.

The utility model belongs to the technical field of communication pipeline construction, and discloses a silicon core pipe framed bent for shaping a communication electric power pipe, which comprises a supporting part, a first metal framed bent assembly for shaping the communication pipe and a second metal framed bent assembly for shaping the electric power pipe, the first metal framed bent assembly and the second metal framed bent assembly are arranged on the two sides of the upper surface of the supporting part respectively, and the distance between the close sides of the first metal framed bent assembly and the second metal framed bent assembly is not smaller than 10 cm. Through the cooperation of the first metal bent frame assembly and the second metal bent frame assembly, the step of laying the silicon core pipe is simplified so as to improve the installation efficiency, the electric power pipe and the communication pipeline are spaced by a certain distance, the interference of electromagnetic waves can be weakened to a certain extent, and meanwhile, the electromagnetic shielding coating is coated on the outer surface of the bent frame, so that the electromagnetic shielding effect is improved. And the interference of electromagnetic waves is further weakened, so that smooth transmission of communication signals is ensured.

This utility model discloses a circuit board, an antenna device, and an electronic device. The circuit board includes a substrate, a first radiating arm, a second radiating arm, and a first ground layer. The substrate includes a first clearance area and a second clearance area spaced apart along a first direction. The first radiating arm is disposed in the first clearance area and has a first ground portion. The second radiating arm is disposed in the second clearance area and has a second ground portion. The first ground layer is disposed on the substrate and offset from the first and second clearance areas. At least a portion of the first ground layer is disposed between the first and second clearance areas to separate the first and second radiating arms. The first ground layer is grounded to both the first ground portion and the second ground portion. This circuit board can meet the isolation requirements of adjacent antennas, facilitating the integration of the radiating arms of the antenna device onto the circuit board, thereby contributing to the miniaturization of electronic devices.

This invention relates to the field of machine vision inspection technology, specifically a machine vision-based online image detection method for material particle size. The method includes: acquiring a grayscale image sequence of material flow from a conveyor belt; enhancing the image by suppressing background noise; segmenting particle regions and extracting particle contours based on edge information; constructing pseudo-boundaries by combining particle edge curvature changes and local grayscale minimum distribution characteristics; and separating adhered and overlapping particles using an improved connected component analysis algorithm. The method calculates geometric features such as particle projected area and equivalent diameter, determines particle size levels by comparing with grading thresholds, and statistically analyzes the proportion of particles at each size. Finally, it calculates continuous mass flow distribution data by combining the conveyor belt running speed and generates an online detection report. This method effectively solves the problem of particle stacking and segmentation, stabilizes and refines particle recognition accuracy, and achieves integrated real-time detection of material particle size and conveying flow rate, making it suitable for continuous material conveying operations in industrial settings.

The invention particularly relates to a conveying system which comprises a rack, and the rack is provided with a first rail extending in the conveying direction and a second rail distributed on the side edge of the first rail; the roller conveying belt is laid on the first track and extends in the length direction of the first track; the chain conveying belt is laid on the second rail and extends in the length direction of the second rail, and the chain conveying belt and the roller conveying belt are in transmission connection and conduct synchronous conveying. According to the conveying system provided by the invention, the goods conveying route comprises the chain conveying belt and the roller conveying belt, the chain conveying belt is in transmission connection with the roller conveying belt, the chain conveying belt is used for conveying heavy goods, and the roller conveying belt is used for conveying light goods, so that two types of goods can be conveyed through one conveying line; the application range of the conveying line is widened, and the economic cost and the time cost for conveying different kinds of goods are reduced.

The present application relates to the technical field of automobile parts detection, in particular to a kind of automobile air conditioner compressor valve group air tightness detection method, comprising: acquisition is detected valve group multiple detection cycle in original air tightness detection data set collected by intelligent sensing system, data set includes pressure decay sequence, leakage acoustic wave sequence and mounting seat vibration sequence.Pressure decay sequence extracts pressure leakage feature vector, and acoustic fingerprint feature vector is obtained by analyzing leakage acoustic wave sequence.Improved nearest neighbor classification algorithm with feature dimension weighted distance measurement is used to determine sample similarity, two types of feature vectors are classified jointly, and leakage mode classification result is output.Air tightness detection conclusion is generated in combination with classification result and vibration sequence.The method can accurately determine the leakage condition of the valve group and locate the specific position of the leaking valve piece, improve the detection dimension and fault positioning accuracy, and adapt to the fine air tightness detection application of the valve group.

The utility model discloses a vacuum laser welding device. The vacuum laser welding device comprises a laser welding assembly and a vacuum assembly. The vacuum assembly and the laser welding assembly are arranged in a spaced mode in the first direction, the vacuum assembly is provided with a vacuum cavity, the vacuum cavity is used for fixedly placing a to-be-welded part, the vacuum assembly comprises a protection lens, and the laser welding assembly and the vacuum cavity are located on the two sides of the protection lens in the first direction correspondingly; and laser emitted by the laser welding assembly penetrates through the protection lens and falls onto the to-be-welded part. The vacuum laser welding device can restrain generation of plume in the welding process.

An access node transmits, in a downlink signal having a series of subframes, a beam-formed reference signal in subframes, where the beam-formed reference signals are transmitted in fewer than all of the subframes of the downlink signal. A first subset includes beam-formed reference signals corresponding to a first frequency or first localized range of frequencies, and a second subset includes beam-formed reference signals corresponding to a second frequency or second localized range of frequencies. The second frequency or second localized range of frequencies is spaced apart from and differing from the first frequency or first localized range of frequencies. A user equipment, UE, receives, in the downlink signal, the beam-formed reference signal in each of a plurality of subframes. The UE performs mobility management measurements using at least the first subset of the received beam-formed reference signals and performs RLM using the second subset of the received beam-formed reference signals.

The application discloses an English letter recognition method and device based on machine vision and a medium, relates to the technical field of image recognition, and comprises the following steps: collecting an original image, performing grayscale and denoising processing to obtain a denoised grayscale image, correcting the denoised grayscale image and performing binaryzation processing, delimiting a connected domain, and obtaining a binary letter image; performing iterative pruning on the binary letter image, setting nodes and edges, summarizing a skeleton graph structure, calculating the path length of the edges and the curvature and bifurcation degree of the nodes, and labeling the skeleton graph structure to obtain a skeleton graph structure with topological filtering labels; setting a topological complex according to the skeleton graph structure with topological filtering labels, constructing the input of a graph neural network model, and completing the training of the graph neural network model; and inputting a node feature matrix into the graph neural network model to obtain a letter recognition result. Through the training of the graph neural network model, the recognition accuracy of complex, careless or deformed letters is improved.

The invention discloses a feed mixing device for goat breeding, belonging to the technical field of feed mixing equipment. The feed mixing device for goat breeding comprises a control box, one end of the control box is connected to a transmission box, the upper part of the transmission box is connected to a working box, one side of the working box is provided with a water inlet hole, and the end of the working box away from the water inlet hole is provided with a plurality of feed inlets. A working area is set, and a ratchet in the working area can limit the rotation direction of the ratchet wheel, thereby limiting the rotation of an empty rod, so that the empty rod does not rotate during mixing, thereby ensuring the stability of the stirring rod during mixing, and at the same time, the empty rod can rotate during cleaning, so that various places on the upper stirrer can be in contact with the water source for cleaning, thereby reducing mutual obstruction between devices and improving the cleaning effect, and through a pair of scrapers and a pair of partition plates, the device can reduce residues when recycling the mixed goat feed, thereby reducing the debris in the device during cleaning.

The application discloses a hierarchical diagnosis and treatment system and method based on drug correction and data processing, equipment and medium, relates to the technical field of intelligent medical treatment and artificial intelligence auxiliary diagnosis, and is applied to a computer device, and comprises the following: a pre-screening drug adjustment module, which evaluates a drug interference risk based on a drug influence factor database and generates an adjustment scheme containing an elution plan; a preliminary fusion module, which collects health data after elution and initial values of indexes and fuses heterogeneous characteristics; a feature input module, which inputs the preliminary fusion characteristics, a drug scheme characteristic and the initial values of the indexes into a target index correction model containing a cross-attention encoder and a drug correction subnetwork; a target fusion module, which obtains target fusion characteristics through encoder mode interaction fusion; an index correction module, which obtains target index values through correction by the correction subnetwork; and a hierarchical diagnosis and treatment module, which generates diagnosis and treatment suggestions according to the target index values, effectively eliminates drug interference bias and realizes reasonable hierarchical diagnosis and treatment.

The application discloses a crop environment quantitative evaluation and decision system based on growth stage self-adaptation and relates to the technical field of agricultural wisdom decision-making.The data acquisition module collects original environmental data sequences of multiple types of sensors in the field;the dynamic identification module analyzes the sequences by using a preset crop growth stage identification model, identifies the current growth stage, and outputs a corresponding key environmental parameter weight template;the feature fusion module fuses the original data according to the template to generate a stage-adaptive environmental feature vector;the state evaluation module converts the vector into a growth state quantitative evaluation value through a growth state evaluation model;and the decision trigger judgment module compares the preset dynamic threshold interval corresponding to the growth stage according to the growth state quantitative evaluation value, and generates a decision trigger instruction when the growth state quantitative evaluation value deviates.The application realizes stage self-adaptive intelligence of crop growth monitoring and decision-making, and improves the accuracy of environmental state evaluation and the timeliness of management decision-making.

This invention discloses a creatine kinase detection kit that counteracts lipemia interference and its preparation method. The kit includes reagent R1 and reagent R2; reagent R1 includes: purified water, imidazole, MgAC, and EDTA Na. 2 Glucose, PC300, Na 2 SO 3 N-acetylcysteine, NADP, AMP, ADP, AP5A, HK, and surfactant; reagent R2 includes: pure water, Capso, creatine phosphate, PEG6000, and NaN. 3 The kit contains BSA and G6PDH. The surfactant is one or a combination of two of Triton 100 and Tween 80. Through the synergistic effect of PEG6000 and the two surfactants Triton 100 and Tween 80, the creatine kinase detection kit significantly improves its resistance to lipemia interference and enhances its detection accuracy. The kit is simple to prepare, has strong resistance to lipemia interference, simple components, and low preparation cost, making it highly promising for market application.

This invention discloses a uniformly distributed radiation energy structure for a millimeter-wave antenna, comprising a transmitting array antenna and / or a receiving array antenna composed of at least one comb-shaped antenna assembly; the comb-shaped antenna assembly includes an elongated antenna body and a microstrip line radiating assembly, one end of the antenna body being connectable to a millimeter-wave circuit capable of generating millimeter waves, and the microstrip line radiating assembly comprising multiple intermediate microstrip line radiating elements spaced apart in the middle section of the antenna body, and an end microstrip line radiating element located at the tail end of the antenna body, wherein the area of ​​the intermediate microstrip line radiating elements gradually increases from one end close to the millimeter-wave circuit toward the other end, so that the distribution of the radiated energy of each intermediate microstrip line radiating element approaches an average.

This invention discloses an intelligent control system for the gradient deployment of cooling tower fans under dynamic greenhouse demand. The system includes a multi-source data acquisition unit for collecting operational data from the greenhouse side and the cooling loop side. The operational data includes greenhouse internal temperature, greenhouse internal humidity, leaf surface temperature, light intensity, supplemental lighting equipment operation status, spraying or atomization status, ventilation execution status, circulating water flow rate, return water temperature, and environmental meteorological parameters. This invention relates to the field of greenhouse environmental control technology. This intelligent control system for the gradient deployment of cooling tower fans under dynamic greenhouse demand dynamically calculates the greenhouse's heat and humidity load requirements based on environmental data and a load propagation chain model. This ensures that the cooling tower system can flexibly adjust fan deployment according to changes in demand, thereby achieving precise cooling. Through fan candidate screening, benefit-cost calculation, and marginal net benefit analysis, the system can intelligently select the most suitable fan for deployment, avoiding energy waste.

The utility model relates to a stray current eliminating device for a gas pipeline. The stray current eliminating device comprises a cathode protection system arranged at a gas gate station and a sacrificial anode buried at a set distance of a gas pipeline section, wherein a diode is connected in series between the sacrificial anode and the gas pipeline to serve as a polar electric drainage device, and only one-way circulation of current from the gas pipeline to the sacrificial anode to the soil is allowed. Compared with the prior art, the subway stray current around the gas pipeline can be better eliminated, and the corrosion risk of the gas pipeline is reduced.

The invention relates to modified ammonium polyphosphate as well as a preparation method and application thereof, belongs to the technical field of fire extinguishing products, and is used for solving at least one of the problems that the flame-retardant efficiency of ammonium polyphosphate prepared by the existing method is reduced, the cost is high, long-acting anti-caking cannot be realized, the solubility is poor and the like. The modified ammonium polyphosphate is prepared by coating ammonium polyphosphate with a macromolecular silane coupling agent, and after APP is coated with the macromolecular silane coupling agent, the caking rate is reduced, and the dissolving capacity is not affected. The hydrophobic chain segment in the macromolecular silane coupling agent synthesized by the invention is longer than that of monomolecular silane, so that the infiltration of small water drops on the surface of APP can be reduced, and the macromolecular silane coupling agent has a better hydrophobic effect; and a longer hydrophobic chain segment has an interference effect on the formation of a crystal bridge, so that the strength of the formed crystal bridge is reduced, and the caking of the APP powder is more easily damaged. The dissolving capacity is improved, the combination of the macromolecular silane coupling agent and the APP powder is only limited to the combination site of the macromolecular silane coupling agent and the APP powder, dispersion in the APP powder is more uniform, and the dissolving capacity is improved.

Disclosed are a data transmission method and apparatus, an electronic device, and a storage medium. The data transmission method includes the following steps: A sequence S1 is inserted before each first data sequence among L to-be-transmitted first data sequences and a sequence S2 is inserted after each first data sequence so as to form L second data sequences, where L is an integer greater than or equal to 2, the sequence S2 consists of N sequences S3 and one sequence S4 that are connected sequentially, and N is an integer greater than or equal to 1; and the L second data sequences are transmitted.

The utility model provides a kind of microchannel flat tube, microchannel heat exchanger and air conditioner, wherein, microchannel flat tube includes microchannel flat tube body and the necking section integrally formed in the end of microchannel flat tube body, the microchannel flat tube body has more than two microchannel holes;The necking section inside is formed with the shunt cavity that each microchannel hole is communicated, and the end of the necking section has the port that the shunt cavity is communicated.According to the technical scheme of the utility model, since the necking section inside is formed with the shunt cavity that each microchannel hole is communicated, refrigerant flows into shunt cavity from port, and shunt cavity can secondary shunt the refrigerant that flows into each microchannel hole, so it can play the effect of secondary shunt, so that the shunt uniformity of each microchannel hole in microchannel flat tube can be improved.

The application discloses a signal transmission method, device, terminal and storage medium, and belongs to the communication field. The signal transmission method of the application embodiment comprises the following steps: performing encoding processing on to-be-transmitted bit data to obtain a modulation signal corresponding to the to-be-transmitted bit data; writing the modulation signal into a first resource domain constructed by a Doppler dimension and a frequency dimension to obtain a modulation signal in the first resource domain; transforming the modulation signal in the first resource domain to a second resource domain constructed by a time dimension and a frequency dimension to obtain a modulation signal in the second resource domain; and determining a transmittable signal of the to-be-transmitted bit data based on the modulation signal in the second resource domain.

The application belongs to the technical field of simultaneous localization and mapping, and specifically discloses a robot algorithm for depth constraint in a dynamic scene, which comprises the following steps: step S1, collecting image information and performing complete segmentation on dynamic objects by using an image segmentation network; step S2, analyzing the motion state of the objects by a depth constraint method, and removing the accurately recognized dynamic regions; and step S3, using a time domain bidirectional pixel point cloud background repair model, utilizing static information in adjacent previous and subsequent frames to complete the repair of the background static key frame where the dynamic objects are located, construct a complete point cloud map, and calculate the pose. p The application solves the technical problems in the prior art that it is difficult to accurately segment potential dynamic objects in a dynamic scene, there are limitations and deviations in judging the dynamic objects, the dynamic objects cannot be accurately removed, and thus the self pose cannot be accurately estimated.

The application provides a multi-model integration method and device based on a synergistic contribution rate, equipment and a medium. The method comprises the following steps: obtaining a verification sample set comprising a plurality of verification samples and a multi-model set comprising a plurality of base models, and generating a plurality of first classification results by traversing the verification sample set; obtaining a plurality of comparison results based on the true label of any verification sample and all the first classification results, and assigning a contribution rate value to each base model based on all the comparison results; generating a synergistic contribution rate based on any base model and all the contribution rate values corresponding to the base model; obtaining a positive score and a negative score of a target model based on a target sample and all the synergistic contribution rates, and determining the target sample based on the positive score and the negative score. According to the technical scheme of the embodiment of the application, the fusion weights of the base models can be quantified by the synergistic contribution rate, so that the overall performance and efficiency of the multi-model integration are improved.

This invention relates to the field of temperature control technology for experimental electric heating furnaces, and discloses a temperature control system and method for such furnaces. The system includes a material composition acquisition and judgment module and a temperature preset module, a three-dimensional temperature monitoring point array module, a graded temperature control execution module, and a main control module. By acquiring data on the composition content of the raw materials, a prediction model predicts the target sintering temperature curve. Simultaneously, temperature data is acquired through the main and auxiliary monitoring arrays, generating a three-dimensional temperature field thermogram with temperature change rates. The main control module employs a fuzzy adaptive PID algorithm to compare the changing trends of the target sintering temperature curve and the three-dimensional temperature field thermogram, generating a control strategy and sending it to the graded temperature control execution module. Point-to-point precise temperature control is achieved through temperature control components corresponding to the auxiliary monitoring array. This system ensures that the temperature field inside the furnace closely matches the target sintering temperature curve, improving the sintering effect.

The utility model belongs to the technical field of optical contourgraphs, and particularly relates to a 3D optical contourgraph, which comprises an optical mechanism, a support mechanism and a protection mechanism, the optical mechanism comprises a support table, an optical scanning device, an optical probe and a first slide rail, the optical scanning device is arranged on the support table, the optical probe is arranged at the bottom of the optical scanning device, and the optical probe is arranged on the first slide rail. A first sliding rail is arranged at the top of the supporting table; the supporting mechanism is arranged on the first sliding rail, the supporting mechanism comprises a sliding table, a sliding groove, a second sliding rail, a movable table and a rack, the sliding groove connected with the first sliding rail is formed in the bottom of the sliding table, the second sliding rail is arranged at the top of the sliding table, and when articles are placed, the sliding table of the supporting mechanism is pulled out, and after the articles are placed on the movable table, the rack is arranged on the movable table. The sliding table is pushed to the position below the probe, the situation that when an object is directly placed, the object collides with the probe and is damaged is avoided, and when the sliding table slides, the protection mechanism is driven to be unfolded for shading protection, and the interference effect of external light is reduced.

The application discloses an asset ledger intelligent checking method based on a learnable fuzzy measure, which comprises the following steps: collecting asset ledger field information and performing standardized and vectorized representation to obtain ledger field vectors; constructing a learnable fuzzy measure to give a capacity parameter to any field subset; based on the capacity parameter, realizing the differentiable calculation of the Suhov integral by using the Lovasz extension to obtain the similarity of candidate asset pairs; constructing a contrast learning objective function with the similarity as the only measure to generate positive sample pairs and difficult negative sample pairs respectively; performing monotone projection and interactive sparse regularization in the training process to obtain an optimized similarity matrix; and outputting checking differences and generating processing suggestions. The application realizes the differentiable integral by using the learnable fuzzy measure and the Lovasz extension to complete field soft matching and anomaly recognition, thereby improving the checking accuracy and the intelligent level.

This invention relates to the field of power generation equipment technology, and more particularly to a vibration monitoring device for marine generator sets. The device includes a mounting plate connected to the generator set to receive vibrations; a housing comprising a support frame and a circuit box, the support frame being mounted on the mounting plate and the circuit box being housed within the support frame; a vibration monitoring mechanism including a vibration receiving component and a vibration monitoring component, the vibration receiving component being mounted on the support frame and connected to the mounting plate, and the vibration monitoring component monitoring the vibration receiving component to obtain vibration frequency and amplitude; and multiple sets of protective mechanisms spaced circumferentially along the support frame and located between the support frame and the mounting plate, for protecting the housing. This invention effectively protects the housing, reduces the impact of debris on the housing, and ensures monitoring accuracy.