49results about How to "Reasonable spatial distribution" patented technology

The invention discloses a self-sucking swirl pneumatic atomizing nozzle device relating to a fuel atomizing evaporation mixing nozzle used for a full-automatic combustion engine and belongs to the field of industrial combustion systems. An atomizing sheet 2, a swirl sheet 3 and a stream guidance sheet 4 are compressed closely by a compression nut 1 and a fixing piece 5; the atomizing sheet 2 is an internal cone and the outlet of the atomizing sheet 2 is a spout 14; the swirl sheet 3 is provided with a tangential air hole 11; the outlet hole of the stream guidance sheet 4 is an oil hole 12 and the outlet of the stream guidance sheet 4 is a swirl chamber; the compression nut 1 is connected with the fixing piece 5 and a connecting piece 7; the outer surface of the upstream of the fixing piece 5 is provided with a seal ring 6; an oil inlet hole 8 is the inner hole of the connecting piece 7; an air inlet hole 9 is the connection hole of the connecting piece 7 along the radical and coaxial direction; compared with the existing centrifugal nozzle or pneumatic atomizing nozzle, the self-sucking swirl pneumatic atomizing nozzle device does not need an oil pump; has the advantages of improving the fuel atomizing evaporation mixing characteristic and the distribution uniformity of oil-gas space, improving the combustion performance, reducing contamination discharge, having no coking and plugging, and is an ideal nozzle for combusting the heavy oil and waste oil by the full-automatic combustion engine.

The present invention belongs to the field of numerically controlled machining technology, and is especially digitalized sneakers tree customizing production apparatus and process. The digitalized sneakers tree customizing production apparatus consists of a main control computer, a 3D foot form scanning instrument and a numerically controlled shoe tree machine connected together. The main control computer forms the sneakers tree template based on the foot form parameters obtained through measuring the loaded foot form with the 3D foot form scanning instrument, zooms and trims the tree template, converts the shoe tree data into an NC file suitable for machining and feeds the NC file to the numerically controlled shoe tree controlling system for driving the shoe tree machine. The present invention may be applied widely in customizing production of different shoes.

The invention discloses a novel slotted disc type permanent magnet eddy current coupling comprising a driving disc, a driving shaft, a driven disc and a driven shaft. The driving disc includes a backiron disc I and a magnetic ring. The driven disc includes an eddy current combined disc and a back iron disc II. The eddy current combined disc consists of an eddy current disc body, a plurality of left iron blocks and a plurality of right iron blocks; rectangular grooves or fan-shaped grooves distributed in an annular array are distributed in the left end face and the right end face of the eddy current disc body, wherein the numbers of the grooves in the left end face and the right end face are equal; the grooves formed in the left end face and the right end face are staggered in a circumferential direction of the eddy current disc body; and the position of any groove in the left end face is not overlapped with the position of any position of any groove in the right end face in the circumferential direction of the eddy current disc body. One left iron block is arranged in each groove in the left end face of the eddy current disc body; and one right iron block is arranged in each groove in the right end face of the eddy current disc body. With the novel slotted disc type permanent magnet eddy current coupling, the torque fluctuation is greatly reduced while the transmission torqueof the coupling is effectively improved.

The invention relates to the technical field of agricultural planting and discloses a method for relay intercropping of ginger and sesame. The method comprises the steps of planting two rows of ginger in land firstly; planting two rows of sesame in a furrow beside the land after seedling emergence, wherein the two rows of sesame are arranged in a zigzag mode after final singling of seedlings; conducting field management normally during cultivation; harvesting in due time. Due to the fact that the crop interplanted with ginger is changed into sesame and the sesame is planted in the furrow beside the ginger land in the zigzag mode, sesame growth is facilitated, light from east and west can be received by sesame sufficiently, light supplying gesture is good, and mutual overshadowing area is reduced; space distribution of the root system of sesame is more reasonable, and nutrient absorption competition between ginger and sesame is reduced; ginger is well shaded, the blades of sesame are staggered to fill the gaps between blades of two plants, and shading area is increased compared with parallel planting. By the adoption of the method, it can be effectively guaranteed that the yields of both kinds of crops are increased at the same time, and considerable economic benefits can be obtained.

The present invention discloses a vehicle steering system optimization method. The method comprises: determining a design of a steering system by using a spatial distribution condition and an input and output constant velocity condition; adjusting the steering system by adjusting an arrangement hard point of a steering pipe column and changing a design structure of the steering system so as to enable the steering system to simultaneously meet the spatial distribution condition and the input and output constant velocity condition; and performing rotating simulation on the steering system to calculate the fluctuation rate of the steering system. According to the vehicle steering system optimization method provided by the present invention, the input and output constant velocity property of the steering system is effectively improved, and the fluctuation property of rotational torque is reduced.

The invention discloses a wall-mounted cabinet for students. The cabinet comprises a cabinet body and supports, the two supports are left and right symmetrically arranged, and mounting plates are leftand right symmetrically arranged at the upper ends and the lower ends of the supports; mounting holes are formed in the mounting plates, sliding grooves are formed in the front sides of the supports,and motors are embedded in the upper portions in the supports; a left threaded rod and a right threaded rod are arranged at the output ends of the motors, the lower ends of the threaded rods are rotatably connected with the lower ends of the sliding grooves, and two lifting plates are arranged on the threaded rods; fixing racks are arranged on the left portions of the front sides of the lifting plates, fixing rings are arranged at the left end of the back side of the cabinet body, and the cabinet body is arranged on the lifting plates through cooperation of the fixing racks and the fixing rings; a cabinet door is arranged on the front side of the cabinet body, connection bass are left and right symmetrically arranged in the middle of the inner side of the cabinet door, telescopic rods arearranged on the connection bases, and the other ends of the telescopic rods are connected with the upper portion of the cabinet body through the connection bases. The wall-mounted cabinet for students is simple in structure and convenient to use, students learn or play the computer on the bed conveniently, and the space is reasonably used so that the storage area can be increased.

The invention provides an enterprise genealogy visual display method, an enterprise genealogy visual display system, computer equipment and a computer readable storage medium, and relates to the technical field of information processing. The system comprises a server and a plurality of clients, wherein each client comprises a visual customization module, a data communication module, a relation graph generation module and a visual display module. The method comprises the following steps: firstly, dividing relation data containing center points according to relation types; constructing a relationship tree and determining a hierarchical relationship by using vertexes of the same relationship type; calculating transverse coordinates to determine the transverse relative positions of the nodes in each relation tree; ensuring that each non-leaf node (the node without the child node is called a leaf node) is in the transverse position center of the child node, so that the transverse distance of the tree is minimized as much as possible, the child nodes are dispersed as much as possible, and finally, an enterprise genealogy with a clear hierarchical structure and reasonable spatial distribution is obtained.

The invention relates to the field of elastic jetting devices and electrified devices, in particular to a portable first-aid kit. The portable first-aid kit comprises a life-saving bomb, a life-savinggun barrel, a variable-speed case and an electric case. The portable first-aid kit can more accurately and efficiently rescue trapped personnel under various situations or transport goods and materials to danger places or the places where people inconveniently go up, and the guarantee of life safety of the trapped personnel in disasters is greatly improved.

A plug-in type heat dissipation lighting device comprises a mounting base, a heat dissipation dome arc plate, a plug-in device and a light-emitting device, wherein the heat dissipation dome arc plate and the mounting base are encircled together to form a mounting cavity; the plug-in device comprises a plurality of plug-in components; each plug-in component comprises a first slide rail, a second slide rail and a plug-in heating panel; the first slide rails are arranged on the heat dissipation dome arc plate; the second slide rails are arranged on the mounting base; the first slide rails and the second slide rails are aligned with each other; and two opposite side edges of the plug-in heating panels are arranged in the corresponding first slide rails and the corresponding second slide rails. According to the plug-in heat dissipation lighting device, through adjusting the number of the plug-in heating panels, different heat dissipation loads can be correspondingly adjusted to meet different heat dissipation demands. Besides, as LED lamp beads are mounted on a mounting curve, the spatial distribution of the LED lamp beads is more reasonable, the light-out angle is wider, and the overall lighting effect is good.

The invention discloses a non-resonant photoacoustic spectrometry system, and belongs to the technical field of gas detection. The non-resonant photoacoustic spectrometry system comprises an infraredwide-spectrum light source, a reflecting cover, a modulation and filtering unit, a photoacoustic cell and a microphone; the photoacoustic cell is of an amplified structure, the diameter of the cross section of a cavity of the photoacoustic cell is increased in the light direction, and the photoacoustic cell comprises a front window and a rear window. The reflecting cover is used for reflecting andconverging the light rays emitted by the infrared wide-spectrum light source to the center of the rear window. When the wide-spectrum light source is placed at the left focal point, light can be effectively gathered at the center of a rear window of the photoacoustic cell, the gathering effect can be optimized under the condition that good light beam collimation is kept, the overall spatial distribution of light beams is reasonable, and the power of the light beams entering the photoacoustic cell is improved; the amplification proportion of the amplified photoacoustic cell is matched with theshape parameters of the reflecting cover, so that the distribution and proportion of light rays emitted to the inner wall of the photoacoustic cell by light beams are reduced to the maximum extent, the same-frequency noise caused by light absorption of the cell wall is reduced, and the signal-to-noise ratio and the detection limit of the system are improved.

The invention relates to the technical field of garment processing, and discloses a clothes storage device for garment processing. The clothes storage device comprises a storage box, wherein a rotating column is rotatably connected to the inner bottom wall of the storage box through a bearing; an annular plate is fixedly connected to the outer surface of the rotating column; a plurality of first clamps are fixedly connected to the lower surface of the annular plate; a mounting cavity is formed in the rotating column; a plurality of sliding grooves are formed in the outer surface of the rotating column; sliding plates are slidably connected into the sliding grooves; and second clamps are fixedly connected to the lower surfaces of the sliding plates. The clothes storage device for garment processing is reasonable in space distribution, the second clamps at the high position can move up and down, a user can hang clothes conveniently, peculiar smell on the clothes can be removed through ventilation, the rotating column drives the clothes to rotate during ventilation, the ventilation effect is guaranteed, and working dead corners are avoided; and when ventilation is not conducted, ventilation holes are in a closed state, the clothes are not polluted by dust in air, and the cleanliness degree of the clothes is improved.

The invention discloses a vacuum washing rotary classification garbage can with a vegetable washing pool on top. The garbage can comprises a box body. A sealing door is arranged on the lower part of the box body. The vegetable washing pool is arranged on the top of the box body. A water discharge pipe, a throwing opening and a throwing door are arranged at the bottom of the vegetable washing pool.A washing mechanism is arranged in the box body. A discharge port is arranged on the lower part of the interior of the box body. A plurality of isolation hoppers are arranged on the part, between thethrowing door and the discharge port, of the box body. The interior of the box body is divided into a plurality of cavities which are arranged vertically. Each cavity is connected with a vacuuming mechanism independently. An isolation door is arranged at the bottom of each isolation hopper. A slant classification pipe is in butt joint with the lower part of the discharge port. On the premise thatthe size of the garbage can is not changed, the internal space of the garbage can is made full use of; more storage barrels are arranged to meet the requirement for classification of various garbage;the vegetable washing pool is used in combination with a garbage can body, the space is made full use of reasonably, the problem that in the prior art, when a user opens a garbage can cover and throws garbage into the garbage can, the smell of the garbage inside goes upwards and spreads outwards is solved, and the indoor air environment is protected.

The invention discloses a novel switch cabinet convenient for wire arrangement. According to the invention, a wire arrangement assembly is installed in a switch cabinet shell; a wire arrangement rod is slidably installed between two installation frames; sliding seats are evenly and movably installed in the middle of a sliding groove; a wire clamping groove is formed in the middle of a wire clamping block; a rubber cushion block is bonded to one end of an extrusion spring; an installation assembly is arranged in the switch cabinet shell; multiple mounting plates are evenly and slidably mounted between the two installation frames; and movable blocks are evenly and slidably mounted in adjusting openings. During installation, the height of the wire arranging rod is adjusted, and then the wire clamping block is rotated according to the trend of a wire so as to adjust the angle of the wire clamping block, so the wire is clamped in the wire clamping groove until the wire between the two rows of adjacent electronic devices are arranged; wire arrangement is simple and convenient, and the wire arrangement angle and position are easy to adjust; and the position of the movable block is adjusted, and distance between mounting plates is adjusted according to the total number of the electronic devices, so space distribution is more reasonable.

The invention discloses a fetal heart monitor which comprises a probe, a scrubbing brush, an operation table, length-adjustable supporting legs disposed on the bottom of the operation table, a first storage box used to place the probe, and a second storage box used for water drainage, wherein the operation table comprises a first storage groove used to place the first storage box, a second storage groove used to place the second storage box, and a third storage groove used to place the scrubbing brush; and the first storage box and the second storage box can be separated from the operation table. The fetal heart monitor disclosed by the invention has the advantage that doctors can conduct fetal heart monitoring easily.

The invention relates to a high-pressure fine-water-mist off-road fire-fighting vehicle. The high-pressure fine-water-mist off-road fire-fighting vehicle can effectively solve the problems that the fire-fighting vehicle is small in structural space, small in load capacity, low in off-road performance and low in fire-fighting efficiency. According to the technical scheme, the high-pressure fine-water-mist off-road fire-fighting vehicle comprises an off-road vehicle body; the back part in the off-road vehicle body is divided into equipment bin in the middle and fire-fighting equipment bins on the two sides; a water tank, a high-pressure water pump, a high-pressure reel, a high-pressure fine-water-mist spray gun and a gasoline engine are arranged on a bottom plate, on which the equipment bin is, of the off-road vehicle body; the water tank is connected with a water inlet of the high-pressure water pump; a water outlet of the high-pressure water pump is connected with a water inlet of the high-pressure reel; a water outlet of the high-pressure reel is connected with a water inlet of the high-pressure fine-water-mist spray gun; and windows at the back part of the off-road vehicle body are positioned on the side walls, on which the fire-fighting equipment bins are, of the off-road vehicle body. The high-pressure fine-water-mist off-road fire-fighting vehicle is reasonable in vehicle body space distribution, strong in power, has the structural space and the load capacity which just accord with settings, meets actual combat requirements, is maneuverable, high in road adaptability and high in off-road maneuverability, completely exerts the fire-fighting advance, and has high fire-fighting efficiency.

The invention discloses a rear cross beam of a vehicle and the vehicle. The rear cross beam of the vehicle comprises a first section and a second section. The left end of the first section is suitable for being connected with a left longitudinal beam of the vehicle. The right end of the second section is suitable for being connected with a right longitudinal beam of the vehicle. The right end of the first section is connected with the left end of the second section. The height, in the vertical direction, of at least part of the first section is larger or smaller than that, in the vertical direction, of at least part of the second section. According to the rear cross beam of the vehicle, space near the rear cross beam is more reasonably distributed, other parts are suitable for being installed in the space, and the layout requirements of a power system or other parts of the rear-drive type vehicle can be met.

The invention discloses a simple and portable mechanical manual sugarcane peeling machine in the field of sugarcane peeling mechanical devices. The simple and portable mechanical manual sugarcane peeling machine is characterized in that a hollow annular cavity is arranged on a bracket boss, a left spiral disc and a right spiral disc are respectively mounted in the annular cavity in a matched manner, handles are arranged on the left spiral disc and the right spiral disc, the handle penetrates through a circumferential sliding groove formed in the bracket boss and extends out of the bracket boss, spiral grooves are respectively formed in the left spiral disc and the right spiral disc, left peeling knives and right peeling knives are respectively arranged in pairs, the left peeling knives and the right peeling knives are respectively meshed with the spiral grooves of the left spiral disc and the right spiral disc through tooth-shaped bulges at the bottoms of the left peeling knives and the right peeling knives, a left end cover and a right end cover are respectively provided with end cover sliding grooves, and the left peeling knives and the right peeling knives are arranged in the corresponding end cover sliding grooves in a matched manner. According to the invention, the simple and portable mechanical manual sugarcane peeling machine has the advantages of being simple in structure, convenient to carry and operate, uniform in cutting, high in cutting efficiency, low in manufacturing cost, high in practicability, low in failure rate and easy to maintain.

Disclosed are an automobile multiple power generation system and an automobile. A solar power generation panel is utilized for power generation while thermoelectric power generation is realized by thesolar heat transferred by the solar power generation panel, so as to improve the solar power generation efficiency. A collector lens, such as a Fresnel lens, is mounted above the solar power generation panel, so that the unit area temperatures of the solar power generation panel and a thermoelectric power generation chip can be enlarged effectively, thereby further improving the power generationefficiency of the solar power generation panel and the thermoelectric power generation chip.

The invention provides a low wind resistance type thin evaporator and an indoor unit of an air conditioner and can be used for solving the problems in the prior art that the heat exchange efficiency and the energy-efficiency ratio can not be improved and the cost simultaneously can not be reduced, and the minimization is not beneficial. According to the technical scheme, the evaporator is in a two-folding three-section structure, and is divided into an evaporator A, an evaporator B and an evaporator C; the evaporator A and the evaporator B are respectively in a double-row structure; the evaporator C is in a single-row structure; the evaporator A is connected with the evaporator B; the evaporator C is connected with the evaporator B; and the evaporator C is located at the lower part of the evaporator B. The evaporator provided by the invention adopts a single-row and double-row combined manner, so that that the ultrathin design can be realized; the entire wind resistance of the evaporator can be reduced; the requirement on small space size can be met; and the structure is relatively compact.

A piston (3) for use in an engine cylinder and a piston engine which is provided with said piston (3), the piston (3) comprising: a recess (30) which is formed from a top surface to an inner concavity, the overall space of the recess (30) being a truncated cone shape, wherein the ratio of the upper bottom diameter of the truncated cone to the outer diameter of the piston is 0.25-0.55, and the ratio of the lower bottom diameter of the truncated cone to the outer diameter of the piston is >=0.4. The engine no longer requires a special ignition device, while fuel is combusted more completely, andcombustion efficiency is higher; moreover, the size of an outlet of the recess (30) inhibits the production of knocking, which may correspondingly increase the power and thermal efficiency of the engine.

The present invention relates to the technical field of cotton stalk harvesting equipment and discloses a staggered type stalk drawing machine. The staggered type stalk drawing machine comprises a rack, a suspension connector, extraction components and belt transmission components, wherein the suspension connector is arranged in the front part of the rack, at least one group of extraction components is distributed at intervals on a position, at the lower side of the rear part of the suspension connector, of the rack in a left-right direction, each group of the extraction components includes two extraction wheels being arranged at intervals in a front-back direction, and the outer side of each extraction wheel is provided with one belt transmission component corresponding to the extractionwheel; a front included angle formed by contact between each belt body and the corresponding extraction wheel is named as a stalk drawing inlet, and two stalk drawing inlets in each group of the extraction components form a space in a left-right direction. Cotton stalks entered two pulling bar inlets can be distributed in a staggered manner in a front-back direction so that the interference of twoadjacent rows of cotton stalks in an extraction process can be effectively avoided, and the extraction work of two rows of the cotton stalks can be independently carried out, and the cotton stalks are not easily fractured and are high in recovery rate.

A plug-in type heat dissipation lighting device comprises a mounting base, a heat dissipation dome arc plate, a plug-in device and a light-emitting device, wherein the heat dissipation dome arc plate and the mounting base are encircled together to form a mounting cavity; the plug-in device comprises a plurality of plug-in components; each plug-in component comprises a first slide rail, a second slide rail and a plug-in heating panel; the first slide rails are arranged on the heat dissipation dome arc plate; the second slide rails are arranged on the mounting base; the first slide rails and the second slide rails are aligned with each other; and two opposite side edges of the plug-in heating panels are arranged in the corresponding first slide rails and the corresponding second slide rails. According to the plug-in heat dissipation lighting device, through adjusting the number of the plug-in heating panels, different heat dissipation loads can be correspondingly adjusted to meet different heat dissipation demands. Besides, as LED lamp beads are mounted on a mounting curve, the spatial distribution of the LED lamp beads is more reasonable, the light-out angle is wider, and the overall lighting effect is good.

The invention discloses a vacuum seal garbage can with a vegetable washing sink arranged at the upper part. The garbage can comprises a can body; a sealing door is arranged at the lower part of the can body; the vegetable washing sink is arranged at the top of the can body; the bottom of the vegetable washing sink is provided with a drain pipe, a throwing opening and a throwing door; the position,corresponding to the sealing door, in the can body is provided with a discharging port and a discharging door; a plurality of isolation buckets are arranged at the position, between the throwing doorand the discharging door, in the can body and divide the can body into a plurality of cavities which are formed up and down; each cavity is connected to a vacuumizing mechanism; and an isolation dooris arranged at the bottom of each isolation bucket. The garbage can has the advantages that the airtightness is good, the problem that odor inside a garbage can leaks outwards from a garbage can cover in the past can be solved, the problem that the odor inside the garbage can moves upwards to diffuse outwards when the garbage can cover is opened and garbage is thrown inwards in the past can be solved, the indoor air environment is protected, bacteria breeding in the garbage can can be inhibited, the vegetable washing sink is combined with the garbage can, and the space is fully and reasonablyutilized.

The invention discloses a classified intelligent medical cabinet and a classified storage method, relating to the technical field of classified storage of intelligent medical cabinets, including a classified storage mechanism and a protective sleeve, the classified storage mechanism includes a cabinet body, and several supports are arranged inside the storage cavity The support plate can be adjusted between the side walls on both sides of the storage cavity through the limit mechanism. The limit mechanism includes a push rod and two limit rods. The inside of the support plate is provided with an adjustment cavity, and the push rod passes through the T There is a T-shaped buffer rod slidingly inserted into the type chute, and a hinge rod is symmetrically hinged at one end of the ejector rod close to the T-shaped buffer rod. The guide groove is inserted into the corresponding limit groove. The support plate of the present invention can freely adjust the position up and down in the storage cavity, so that the space distribution in the storage cavity is reasonable, and it can be carried outside to participate in rescue, and can be assembled into a stretcher for outdoor natural disaster rescue, which is convenient for the turnover of the wounded.

The invention discloses an overpass without traffic lights at intersections. The overpass comprises straight-going lanes, left-turn lanes, right-turn lanes and right-turn sidewalks, wherein the right-turn lane and the right-turn sidewalk of each intersection are arranged on the ground surface with an elevation of + / -0.0; the straight-going lanes of this intersection and an opposite intersection, the left-turn lanes of this intersection and the opposite intersection, the straight-going lanes of left and right intersections, and the left-turn lanes of the left and right intersections form a multilayer overpass with two layers below the ground surface with the elevation of + / -0.0, a + / -0.0 ground surface layer and overhead roads; and according to lane arrangement in a forwarding direction from left to right, each intersection sequentially comprises a straight-going lane, a left-turn lane, a right-turn lane and a sidewalk. The overpass disclosed by the invention has the characteristics of being short in distance of travel, simple and compact in structure, small in floor area, and small in investment, having no need to remove surrounding buildings for construction, and avoiding influence on foundations of the surrounding buildings, so that intersections of roads do not need traffic light control, motor vehicles can achieve barrier-free passage directly when passing through intersections, and the traffic capacity of an intersection of a road is greatly improved.

The invention discloses a chemical fiber electric oven, which comprises a rectangular box body. A plurality of drying trolleys are evenly placed in the inner cavity of the rectangular box body. Each of the drying trolleys has a car body and a A plurality of drying plates for shelving chemical fibers distributed at equal intervals on the car body, each of the drying plates is covered with an electric heating net, and a wave-shaped heat insulation is arranged between two adjacent drying trolleys One end of the wave-shaped heat insulating plate is fixedly installed on the upper surface of the inner wall of the rectangular box, and the other end of the wave-shaped heat insulating plate is fixedly installed on the lower surface of the inner wall of the rectangular box; the side wall of the rectangular box is provided with Power supply control cabinet, the top of the rectangular box is provided with switch valves. The chemical fiber electric oven has concentrated heat energy, is not easy to volatilize, and has high use efficiency.

The invention discloses an electric meter box comprising a mounting rack, the left side and the right side of the mounting rack are both provided with convex lugs, a first shaft sleeve is rotatably connected in each convex lug, the opposite ends of the two first shaft sleeves are both provided with end covers, the opposite end surfaces of the two end covers are both fixedly provided with bases, and the opposite end surfaces of the two bases are both fixedly provided with first square convex columns. Second square convex columns are arranged on the opposite end faces of the two first square convex columns, and a third square convex column is arranged between the opposite end faces of the two second square convex columns; a connecting plate assembly is hinged between the opposite end faces of the two second square convex columns, a first mounting plate assembly is hinged to the connecting plate assembly, a second mounting plate assembly is hinged to the first mounting plate assembly, and the first mounting plate assembly and the second mounting plate assembly are used for mounting electricity meters; the electric meter box further comprises a positioning assembly. A knob assembly and a driving assembly are arranged on a mounting frame; the electric meter box is simple in structure, small in size and convenient to operate and use.