1021results about How to "Reasonable design" patented technology

The invention discloses a composite protective structure resistant to blast shock which is mainly a point truss honeycomb integral protective structure formed by a honeycomb tensile layer and a lattice truss-type compression resistance layer through welding spots and connecting keys, and a foam energy absorbing layer is added on the outer layer. According to the composite protective structure, theforce transmission path of a concrete protective structure under the action of blast is innovatively optimized, the resistance level of the protective structure can be greatly improved, and the structure ductility is improved; and the dispersion of concrete fragments in the structure can be restrained, and the phenomenon of blast and explosion-induced collapse of similar traditional concrete protective structures is eliminated.

The invention discloses an electric power distribution method convenient for maintenance. By arranging a second threaded column (21) and an extrusion plate (22), when the second threaded column (21) rotates, the extrusion plate (22) can be driven to rotate, then the extrusion plate (22) can drive a friction pad (27) to rotate, and when the friction pad (27) is connected with the lower surface of the inner wall of a shell (1) in a lap joint mode, a support plate (17) can be fixed; and by arranging a stop block (28), when the back face of a second protection plate (10) is connected with the front face of the stop block (28) in a lap joint mode, a first threaded column (13) can be more conveniently connected with a second threaded sleeve (14), and therefore the second protection plate (10) can be better fixed. The electric power distribution method convenient for maintenance has the advantages that the structure is compact, the design is reasonable, and the practicability is high.

The inventive technique process of grainy calcium material for preventing and treating peanut blight primarily includes: adopting the shell powder and weathered coal as raw materials, machining into peanut blight prevention material through agglomeration granulation. The invention has innovative and reasonable design, which not only has simple process, easy implementing, but also has low cost of raw materials, product application convenience, remarkable peanut blight prevention effect, and capability of promoting high-efficient production pf peanut. In particular, the invention applies coastal oyster shell wastes for machining calcium materials for preventing and treating peanut blight, which not only reduces environmental pollution, but also promotes recycling of resources, has very significant economic, social and ecological benefits and greater promotional value.

The invention provides an electrical button, which has a accommodating groove with a accommodating cavity, an elastic fixing member and a rigid pressing member are arranged on the accommodating groove; the elastic fixing member has an upper ring cover and a lower ring cover, forming a first clamping groove; the upper ring cover and the lower ring cover The outer periphery of the ring cover is connected by the cap wall, and the lower end of the cap wall is clamped in the connecting groove of the side wall of the receiving groove; the outer periphery of the lower end of the cap wall is provided with an upper fixing edge and a lower fixing edge to form a second clamping groove; The first clamping plate in the first clamping groove, the first clamping plate is provided with a pressing plate; the first clamping plate is provided with a guide post, and the lower end of the guide post is provided with a moving contact; the bottom surface of the receiving cavity is provided with a first static contact and the second static contact; the outer guide post is provided with an elastic piece, the upper end of the elastic piece is provided with an upper fixed end, and the lower end is set with a lower fixed end; the upper fixed end is clamped in the upper fixing groove of the first clamping plate, and the lower fixed end is clamped Connected to the lower fixing groove in the receiving cavity. The invention realizes double reset through the cap wall and the elastic member, so as to avoid the push button from being dead; the sealing performance is good, and dust and water are prevented from entering.

This invention discloses a double-layer fully automatic opening and closing roller beam device for subway rail transportation, including an upper roller beam, a lower roller beam, a drive column, and side columns corresponding to the drive column. The horizontally transverse upper roller beam is rotatably mounted on the drive column at one end and rests on the side column at the other end. It also includes an automatic control mechanism and a roller beam rotation support mechanism on the same longitudinal line as the drive column. The automatic control mechanism includes a control host and several position sensors installed on the side columns and the roller beam rotation support mechanism to transmit the position information of the upper roller beam. The position sensors feed back signals to the control host to automatically control the opening and closing of the upper roller beam. It is installed on an adjustable height support beam, which includes a support beam, crossbeam support feet, and a crossbeam height adjustment mechanism. It has the advantages of fully automatic opening and closing of the roller beam, simple operation, time and labor saving, high personal safety factor, and high overall structural stability.

The invention relates to a light and miniature big-target-surface low-light lens, and the lens comprises a front lens group A, a diaphragm B and a rear lens group C, wherein the front lens group A, the diaphragm B and the rear lens group C are sequentially arranged in an incident direction of an optical path. The front lens group A includes a positive meniscus lens A1, a negative meniscus lens A2,a biconcave lens A3 and a biconvex lens A4, wherein the positive meniscus lens A1, the negative meniscus lens A2, the biconcave lens A3 and the biconvex lens A4 are sequentially arranged in an incident direction of the optical path. The biconcave lens A3 and the biconvex lens A4 are in close connection with each other as a first bonding group. The rear lens group C includes a biconcave lens C1, abiconvex lens C2, a biconvex lens C3, a plano-convex lens C4 and a negative meniscus lens C5, wherein the biconcave lens C1, the biconvex lens C2, the biconvex lens C3, the plano-convex lens C4 and the negative meniscus lens C5 are sequentially arranged in an incident direction of the optical path. The biconcave lens C1 and the biconvex lens C2 are in close connection with each other as a secondbonding group. The invention also relates to an imaging method of the lens. The lens is reasonable in design, effectively improves the imaging quality under the requirement of the large target surfaceof the lens, reduces the number of optical lenses, and realizes light and miniature lens. The lens has strong light collecting and light transmitting ability, and the target surface of the lens is large. The lens is high in optical resolution, is large in angle of view, and is large in observable range.

The utility model provides a self-propelled sunflower harvester, which belongs to the technical field of agricultural machinery and structurally comprises a self-propelled vehicle machine and a frame, a header is arranged at the front end of the frame, and a primary conveyor and a secondary conveyor are communicated with the rear of the header. The rear part of the secondary conveyor is communicated with a thresher; a screening mechanism is arranged below the thresher, and the screening mechanism is composed of a first-stage vibrating screen which is composed of a swinging fish scale screen and rushes backwards, and a second-stage vibrating screen which is composed of a swinging stepped dense mesh screen and rushes forwards; the screening mechanism communicates with the conveying and lifting mechanism. The conveying and lifting mechanism comprises a transverse auger and a bucket elevator. And the conveying and lifting mechanism is connected with the grain collecting hopper. The sunflower seed and sunflower disc separating device can achieve good separation of sunflower seeds and sunflower discs, the sunflower seeds and the sunflower discs are respectively conveyed in two paths during threshing, and simple and efficient threshing separation can be achieved. The threshing process is automatically completed, manpower and material resources are saved, and good harvesting and harvesting effects are achieved.

The invention relates to the technical field of three-dimensional point cloud data processing, and provides a subsidence-water-area-oriented point cloud stripe noise LTCF elimination method and system, and the method comprises the steps: obtaining point cloud data, preprocessing, filtering, and optimizing point cloud output. The filtering processing comprises the following steps: local covariance feature extraction: aiming at each target point in the preliminarily optimized point cloud obtained by preprocessing, constructing a k-nearest neighbor domain, and calculating local covariance contribution values of each target point in X, Y and Z spatial directions; compared with the prior art, the method has the following beneficial effects that the industrial pain point of a subsidence water area scene is solved, a three-direction covariance joint judgment mechanism is innovatively introduced, exclusive recognition logic is designed for specific low-elevation strip noise only containing XY-direction covariance in the subsidence water area, the lamellar strip noise which cannot be recognized completely by a traditional algorithm can be accurately captured, and the recognition accuracy of the subsidence water area scene is improved. And the problem of eliminating the point cloud core noise of the subsidence water area is solved fundamentally.

The utility model discloses a kind of bearing bush cooling devices, it is related to pump station cooling system technical field, including host computer pump cooling unit, bearing bush cooling unit, intelligent control system, the bearing bush cooling unit includes gas-liquid separator, compressor, condenser, liquid accumulator, drying filter, liquid mirror, expansion valve and evaporator sequentially through pipeline connection, form closed refrigeration cycle loop, exhaust pipe on the outlet of compressor is provided with pressure sensor, temperature sensor, pressure controller, the air inlet pipe and exhaust pipe of the compressor are respectively provided with third pressure gauge, the pressure controller is electrically connected with pressure sensor, third pressure gauge, realizes winter system pressure intelligent regulation by pressure controller, not only effectively avoid the equipment failure caused by pressure anomaly, also greatly improve the operation efficiency of system in winter harsh environment, energy saving, ensure equipment operation safety.

The application discloses a kind of bathroom cabinet processing plate waste crushing recycling equipment, including crushing box, fixed blade is equidistantly arranged between the inner surface of longitudinal two sides of crushing box, two first rotary shafts are symmetrically arranged between the inner surface of transverse two sides of crushing box, rotary blade is cross arranged between the fixed blade of first rotary shaft, transmission gear is installed at one end of two first rotary shafts and passes through crushing box, transmission gear is engaged, and driving motor is arranged on the outer surface of transverse side of crushing box.The beneficial effects of the present application are:the present application is reasonable in design, and the overall structure is stable and firm, which can not only realize the crushing and recycling of plate waste generated during the production and processing of bathroom cabinet, but also avoid the floating of debris and dust generated during the crushing and recycling of plate waste to the surrounding air, ensure the air quality of surrounding environment and the health of operators, and the crushed plate waste can be filled into the storage tank for centralized treatment.

The utility model discloses a kind of scooter controller end cover and scooter, the controller end cover includes end cover body, door leaf, hinge, plug-in door column, plug-in buckle, wire harness cavity;End cover body is set as plate block structure and is provided with cavity in center, two door leaves are symmetrically placed in cavity, the root of door leaf is connected with end cover body by its hinge, and door leaf is opened or closed by rotating through its hinge;The outer end of door leaf is provided with prefabricated hole, and wire harness cavity is formed through wire harness;Sealing glue is provided between wire harness cavity inner wall and wire harness;The back of one door leaf is provided with plug-in buckle, the back of another door leaf is provided with matching plug-in door column, and form snap structure fixed.The utility model controller end cover only rotates by its own hinge, and locking is realized when closing by its own snap structure, assembly operation is very simple, convenient to maintain, and stability is high.

The utility model relates to a kind of mobile phone support, specifically a self-locking type oblique roof vacuum mobile phone support, the mobile phone support includes suction disc main body, suction disc main body includes bottom disc and cover is set on the surface cover of bottom disc, unlocking block, locking block and oblique roof block are set between bottom disc and surface cover, wherein surface cover is contact connection with unlocking block, and surface cover includes main cover plate, limit strip is fixed in the lower end surface of main cover plate, unlocking block includes center body and arrowhead body fixed on center body, limit slot is formed in the upper end surface of center body, limit strip is slidably arranged in limit slot, and can linearly move in limit slot, upper positioning block and lower positioning block are fixed on the end of arrowhead body away from center body, upper positioning block is located in the position above lower positioning block, and spring limiting slot is formed between upper positioning block and lower positioning block. The self-locking type oblique roof vacuum mobile phone support, the operation of adsorption and un-adsorption is very simple and convenient, and use experience is improved.

An adjustable thin-layer silicone cloth production device includes a coating device, a transfer device, and a flattening device. The coating device is divided into two or more coating and drying zones. A hot air box is installed on the top of the coating device, and a fiberglass cloth unwinding device is installed near the feed inlet. Each coating and drying zone is equipped with at least one double-sided coating device and at least one hot air conveying pipeline. The transfer device includes at least one transfer roller assembly installed inside a transfer box. The flattening device is divided into two or more flattening zones by horizontal partitions. A silicone cloth winding device is installed near the discharge outlet. Each flattening zone is equipped with a flattening mechanism, which can be a heated flattening mechanism, a room-temperature flattening mechanism, or a cooled flattening mechanism. This invention has a reasonable design, is easy to operate, and has the advantages of stable operation, high production efficiency, and good product quality.

This invention discloses a lightweight method for detecting foreign objects (FOOs) in power transmission lines, relating to the fields of power line inspection and computer vision. A YOLOv10-based FEO detection model is constructed, comprising a feature extraction part, a feature interaction part, and a detection head part. The C2f module in the feature extraction and feature interaction parts is replaced with an expert dynamic extraction module, and the detection module in the detection head part is replaced with a parameter-sharing detection module. The trained FEO detection model is obtained by collecting and evaluating a calibrated FEO dataset of power transmission lines. FEO keyframes are input into the trained FEO detection model to obtain detection results. The expert dynamic extraction module acquires feature maps from multiple receptive fields, achieving rich representation in FEO detection environments with varying scales. The parameter-sharing detection module, based on this, reduces redundant computation and enhances the semantic representation of small targets through parameter sharing and grouping normalization, effectively improving the efficiency of FEO detection in power transmission lines.

The utility model discloses a textile yarn roll pay-off device, including the platen, the platen is installed seat board on interval, and the vertical connecting axle rod on seat board, and the axle rod one side sets up the pressure tile, and the ear seat is set up on the outer surface of pressure tile interval, and the ear seat is set up boost mechanism between the upper and vertical board, and the ear seat is set up thrust mechanism between the lower and vertical board, and the vertical board outside connects the pneumatic cylinder, and the telescopic rod of pneumatic cylinder connects thrust mechanism, with simple structure, reasonable in design, novel and unique thought, through the telescopic rod of pneumatic cylinder's extension and retraction, and utilize the lower spring to drive pressure tile to approach or away from yarn roll, and the lower spring is compressed short simultaneously, and the force of the lower spring pushes the pressure tile to be always attached to the yarn roll surface, guarantee yarn on yarn roll under the traction in the process of paying-off, and only pay-off will be pulled by traction, avoid yarn roll free rotation and pay-off, avoid the yarn roll free pay-off and knot of traction inertia.

The utility model discloses an acylation wastewater receiving tank convenient to clean, which comprises a bracket, a tank body is arranged on the bracket, a rotating shaft is rotatably connected in the tank body, the end part of the rotating shaft penetrates through the tank body, one end of the rotating shaft is connected with a motor, the motor is arranged at the outer end of the tank body, ring seats are symmetrically sleeved on the rotating shaft, a U-shaped frame is connected between the ring seats, and the outer side surface of the U-shaped frame is connected with a scrubbing brush. A plurality of water distribution pipes are connected to the water distribution pipe at intervals, the water distribution pipes penetrate through the side wall of the tank body, one end of each water distribution pipe is blocked, and the other end of each water distribution pipe is connected with a main water pipe; the cleaning device is simple in structure, reasonable in design and novel and unique in idea, the motor drives the rotating shaft to rotate, the U-shaped frame rotates along with the rotating shaft and drives the scrubbing brush to clean dirt on the inner wall of the tank body, and in the rotating process of the scrubbing brush, the water distribution pipe sprays water liquid on the inner wall of the tank body to promote dirt cleaning on the inner wall of the tank body.

The utility model discloses an office table storage cabinet, it includes office table and storage cabinet, and the storage cabinet is located in the side portion of office table, the storage cabinet includes the cabinet body and storage box, and the cabinet body has the cavity, and the cavity runs through the bottom of cabinet body, and the storage box is connected into the cavity, and the bottom of storage cabinet is provided with the pulley to assist the storage box and moves into or moves out the cavity, and the front end face of storage cabinet is provided with the handle to move the storage box through the handle. It has simple structure, compact cooperation, reasonable in design and the advantages such as, therefore, it is a kind of product with superior performance in technicality and economy.

This utility model discloses a cooling water circulation system for a freeze dryer, including a refrigeration unit and a cooling water tank. The refrigeration unit is connected to the cooling water tank via pipelines. The outlet of the cooling water tank is connected to a first freeze dryer and a second freeze dryer via a main pipeline. The first and second freeze dryers are connected to the return outlet of the cooling water tank via return pipes. The outlet of the cooling water tank is connected to the main pipeline. A water pump and a shut-off valve are installed on the main pipeline. The main pipeline is connected to a tee. The first freeze dryer is connected to the tee via a first branch pipe, and the second freeze dryer is connected to the tee via a second branch pipe. The diameters of the first and second branch pipes are different. This utility model has a simple structure and reasonable design, allowing both freeze dryers to receive a matching water intake, thereby ensuring the refrigeration effect and meeting production needs.

The utility model relates to the technical field of brake pad production equipment, in particular to a drum brake pad flexible side edge machining device which comprises a rack, and the rack is provided with a machining unit, a supporting unit, an adjusting unit and a first driving device. The machining unit comprises a grinding wheel and a second driving device for driving the grinding wheel to rotate; and the adjusting unit comprises a base, a support used for fixing the second driving device is arranged above the base, and the base is rotationally connected with the rack through a rotating shaft. The base is rotationally connected with the rack, and the machining unit is arranged above the base, so that the machining requirements of different side edges of the brake pad are met by rotating the rotating shaft, adjusting the angle between the base and the horizontal plane and adjusting the angle of a grinding wheel in the machining unit. The side edge machining device can be used for machining side edges of different types of brake pads, and the diversified flexible machining requirements of different side edge requirements of the brake pads are met.

The utility model discloses an anti-drop glue dispensing needle for a die bonder, which comprises a glue dispensing needle body, the bottom of the glue dispensing needle body is provided with an end plane, the middle of the end plane is connected with a cylindrical glue head which is longitudinally arranged, the diameter of the glue head is smaller than that of the glue dispensing needle body, the end plane is provided with an anti-drop glue groove which is recessed upwards, and the glue dispensing needle body is provided with a glue dispensing groove which is recessed upwards. The glue falling prevention groove is arranged to be in a circular ring shape, and the glue falling prevention groove is arranged around the gluing head. The glue dispensing head is simple in structure and reasonable in design, and can solve the problem that the glue is easy to throw off in the high-speed swinging working process after the glue is taken by the glue dispensing head.

The utility model discloses a steel structure support base, including lower base, upper base, steel structure installation groove, anchor rod, protection board, the lower base is welded with upper base on, and the upper base is seted up steel structure installation groove, and the lower base four corners are installed with anchor rod, and the anchor rod is hit into the ground, and the lower base both sides are installed with protection board, and the protection board is inverted L type design, and two protection boards staggeredly set up, the lower base is seted up round hole, and the installation of anchor rod is carried out in the round hole, the anchor rod is hollow design, and a plurality of slip casting hole is seted up on the anchor rod, and the lower base is equipped with the clamping groove of screw mounting, and the protection board is inserted with the clamping groove. The utility model discloses reasonable in design, and the protection board can protect lower base, upper base, avoid the damage of collision to it and then influence the support of steel structure.

This invention relates to the field of multi-target search using swarm robots, proposing a multi-source localization method based on virtual targets and a virtual population using particle swarm optimization (PSO) algorithm. This method utilizes a swarm of robots with certain communication and sensing capabilities to achieve multi-source target search and localization. The method equally divides the search area into multiple units, each with a virtual target at its center. Only one group of robots traverses all virtual targets and uses the PSO algorithm to search the corresponding regions of each virtual target, ultimately covering the entire search space. Common grouping methods in this field suffer from the difficulty in determining the number of groups, and their performance decreases as the number of source targets increases. The method proposed in this invention requires only one group to complete multi-source target localization, thus greatly reducing the number of robots needed and reducing physical costs. Furthermore, this method can be adapted to large-area passive scenarios.

The utility model discloses a testing device for testing the flow coefficient of a flow regulating valve. The testing device comprises a water tank; the flow regulating valve is arranged on the main pipeline; the differential pressure sensor is connected to the main pipeline on the two sides of the flow regulating valve; the pressure difference regulating valve is arranged on the main pipeline; the pneumatic three-way valve is arranged on the main pipeline, an inlet of the pneumatic three-way valve is connected to an outlet of the differential pressure regulating valve, and a first outlet of the pneumatic three-way valve is connected to an inlet of the water tank; the container is connected with a second outlet of the pneumatic three-way valve; and the mass meter is used for measuring the mass of the container. According to the device, a weighing method is adopted for flow measurement, a PLC system is combined for control and data collection, operation of a three-way valve and an auxiliary pump and the rotating speed of the pump are controlled, and signals of a high-precision electronic balance and differential pressure signals of a differential pressure transmitter are collected, so that accurate evaluation of the micro flow regulating valve is achieved.

The utility model belongs to the technical field of household appliance accessories, especially relates to an energy -conserving dish -washer heater, including heater installation flange, electric heating tube and heat -insulating support, heater installation flan includes the inner surface of contact with liquid, the outer surface opposite with inner surface and the interface of being located at the demarcation of inner and outer surface, electric heating tube includes heating section, non -heating section and end, and the both sides of heating section are connected with end through non -heating section respectively, and the end of electric heating tube penetrates the interface of heater installation flange and extends to the outer surface. The utility model adds heat -insulating support between the heating section of electric heating tube and the inner surface of heater installation flange, so that electric heating tube is not directly welded to heater installation flange, so that heat does not directly escape to air through the welding part, improves dish -washer heater energy utilization, and more heat directly heats liquid, and a small part is scattered.

The invention discloses an integrated bulk machine. The bulk machine comprises a machine body supporting seat, a PLC controller, a silo, a dust collecting system, a lifting system and a telescopic barrel, wherein the silo is arranged on the machine body supporting seat in a penetrated mode and is fixedly connected by a fastener; the dust collecting system comprises a dust collecting fan, a dust collecting pipeline and a dust collecting filter barrel; the silo comprises a feeding port, a collecting bin, a discharging port and a curved valve; and the discharging port is fixedly connected with the telescopic barrel, the lifting system matches the telescopic barrel, and the PLC controller is respectively connected with the dust collecting fan, and the curved valve and the lifting system in a communicated mode. The integrated bulk machine has the advantages that each component cooperates with each other, and the machine is reasonable in design; by means of the machine body supporting seat,the whole device system is stabilized; by means of the dust collecting system, the dust pollution caused by transferring the powder can be eliminated; and by means of the lifting system, the change ofthe length of the telescopic barrel can be achieved, so that the whole device is capable of meeting the requirements of a silo of a vehicle body with different heights, the whole device is easy to operate and convenient to transfer, and the bulk machine has wide adaptability and high stability.

This utility model relates to the field of motor technology, and more particularly to a dual-motor transmission module, comprising a cavity, a first pusher and a second pusher movably disposed within the cavity, a first transmission assembly drivenly connected to the first pusher, a first motor drivenly connected to the first transmission assembly, a second transmission assembly drivenly connected to the second pusher, and a second motor drivenly connected to the second transmission assembly. The first motor drives the first pusher to move along the length direction of the cavity via the first transmission assembly, and the second motor drives the second pusher to move along the length direction of the cavity via the second transmission assembly. Receiving grooves are provided at both ends of the cavity, and protective covers are provided on the outer sides of the receiving grooves. This utility model has a compact and reasonable structure, employing two independently operating motors to achieve individual control of the lifting and lowering positions of the head and feet, resulting in high adjustment accuracy, extended service life, and improved performance.

The utility model discloses a steering funnel, which relates to the technical field of magnetic separation equipment and comprises a receiving hopper, a blanking hopper and a steering device, the receiving hopper is used for receiving the finished product material, the mixture and the waste material; the blanking hopper is arranged below the receiving hopper and is used for distinguishing the materials; the steering device is arranged on the receiving hopper and the discharging hopper; wherein the steering device comprises a driver arranged on the material receiving hopper; the rotating assembly is arranged on the discharging hopper; the driver drives the rotating assembly to rotate and drives the discharging hopper to rotate. When the materials need to be distinguished, the driver is started and can drive the rotating assembly to rotate, so that the rotating assembly drives the discharging hopper to rotate, and finally different types of materials can be distinguished to different positions.

This utility model relates to a two-stage manhole cover for gas valve wells, comprising a cover body including a primary manhole cover and a secondary manhole cover. The primary manhole cover is horizontally positioned with a through hole in its center; the secondary manhole cover is horizontally positioned on top of the primary manhole cover and covers the through hole. The advantages of this utility model are its simple structure, reasonable design, and the modular design of the manhole cover, which facilitates operation. It solves the problem of high labor intensity when opening and closing gas valve wells, reduces the frequency of handling and moving heavy manhole covers, thereby protecting the worker's health and improving the efficiency of gas well inspection and daily operation.

This invention discloses a sample introduction and reaction device for detecting pesticide residues in organic solvent extracts using a liquid-phase enzyme inhibition method. The device includes a reaction tube and a cap, which are detachably assembled. The cap seals the reaction tube and contains a hollow column. A sample introduction card is sealed inside the hollow column, and the reaction tube contains enzyme reagents. This invention can be used for the liquid-phase enzyme inhibition method to detect pesticide residues extracted from organic solvents, eliminating interference from organic solvents in the enzyme inhibition detection. The device integrates the sample introduction card and enzyme reagents beforehand, sealing the sample introduction card within the hollow column for easy portability. The hollow column also serves as a support for solvent evaporation from the sample introduction card, facilitating rapid solvent evaporation. The cap and tube serve a dual purpose. This invention features a simple structure, ease of use, simple operation, short detection time, and low cost. It is suitable for on-site testing of large quantities of samples during food distribution and is easy to promote and use.