93results about How to "Reduce shock force" patented technology

Fabric structures having two connection segments and an expansion segment between the two connection segments are provided. The fabric structure includes ground yarns that form a sheath, binder yarns, elongation yarns surrounded by the sheath, and lateral yarns. In the expansion segment, at least some of the lateral yarns are interwoven with the elongation yarns to connect the elongation yarns laterally with the sheath. Heat treatment of the expansion segment shrinks the length of the elongation yarns during manufacture. The sheath does not substantially shrink from the heat treatment relative to the elongation yarns and gathers together in an accordion-like arrangement. A tensile load applied to the fabric structure stretches the elongation yarns and unfolds the gathered sheath. The high strength sheath supports the tensile load when completely unfolded, while the elongation yarns absorbs energy as the fabric structure stretches or elongates.

The invention discloses a mining machine damping base. The mining machine damping base comprises a pedestal. The top of an inner cavity of the pedestal is movably connected with a connecting plate. The bottom of the connecting plate is connected with a supporting rod, and the outer surface of the supporting rod is sleeved with a concave stopping block. The bottom of the concave stopping block is movably connected with a limiting spring. A limiting block is installed at the bottom of the supporting rod. A first supporting plate and a second supporting plate are installed in the inner cavity of the pedestal. Supporting bases are installed at the two sides of the top of the second supporting plate. The outer surface of each supporting base is connected with a buffer spring in a sleeved mode. The tops of the buffer springs are movably connected with the bottom of the first supporting plate. According to the mining machine damping base, due to the fact that the supporting rod, the concave stopping block, the limiting spring and the limiting block are arranged and matched for use, the supporting rod can be stressed to achieve downward pressing when a mining machine is vibrated, and the concave stopping block can be driven to press the limiting spring downwards; and through the limiting spring, the concave stopping block can be driven to achieve fast resetting, and overall vibration of the mining machine can be effectively reduced.

The invention relates to an unmanned aerial vehicle taking off and landing platform based on a parallel mechanism. The platform comprises a base plate, wherein four parallel supporting mechanisms and four damping branched chains are symmetrically arranged on the upper end face of the base plate, one parallel supporting mechanism is arranged between every two adjacent damping branched chains, and each parallel supporting mechanism is provided with a parallel mechanism serving as the main body of the parallel supporting mechanism; the parallel mechanisms have the advantages of being high in dynamic response property, high in rigidity, good in carrying capacity, high in stability, high in motion precision and the like, and have good stable supporting performance; the damping branched chains have good damping performance; an operation table is installed on the upper end faces of the four parallel supporting mechanisms and the four damping branched chains. By the adoption of the platform, the problem of an existing unmanned aerial vehicle calling and transportation method that vibration damage can be caused during calling can be solved, damping calling of an unmanned aerial vehicle can be achieved, and stability and damping performance are high.

The invention discloses hoisting equipment for a water pump. The hoisting equipment comprises a top plate and supporting columns, wherein the supporting columns are fixedly arranged at the two ends ofthe bottom surface of the top plate, a wire wheel bracket is arranged on the bottom surface of the top plate, a rotating shaft is arranged in the wire wheel bracket, a steel wire roller sleeves the rotating shaft, a steel wire rope is wound around the steel wire roller, and a hoisting motor is arranged on one side of the wire wheel bracket; and a hydraulic telescopic rod is arranged on one side of each supporting column, positioning clamping plates are arranged at the front ends of the hydraulic telescopic rods, the bottom ends of the supporting columns are provided with bases, a buffer plateis arranged between the supporting columns, buffer springs are arranged between sliding sleeves and the bases, a damping plate is arranged on the bottom surface of the buffering plate, and moving wheels are arranged at the bottom ends of the bases. According to the hoisting equipment, the structure is simple, hoisting is convenient, the maneuverability is high, and the water pump can be clamped and stabilized in the hoisting process so that the water pump does not waggle easily when placed on the ground; and the buffer plate is arranged between the supporting columns so that the situation that the water pump falls and is damaged due to accidents is avoided, and the safety performance is high.

The invention discloses a steel pipe grinding machine which comprises a workbench. Motor racks are installed on the two sides of the bottom of an inner cavity of the workbench. Motors are installed on the tops of the motor racks. One side of each motor is connected with an output shaft, and one side of each output shaft is connected with an operation table. A sliding block is movably connected to the top of the inner cavity of the workbench. A fixing base is installed at the bottom of the sliding block. A clamping ring is arranged in an inner cavity of the fixing base. The two sides of the clamping ring are each connected with a screw rod. One side of each screw rod is connected with a nut. The bottom of the clamping ring is fixedly connected with a clamping block. The two sides of the clamping block are movably connected with hinge pins. The steel pipe grinding machine is simple in structure and convenient to use, a steel pipe can be fixed with the clamping ring, and thus, a worker can perform the grinding work more conveniently; the clamping ring can be fixed by inserting the hinge pins into the clamping block, so that the steel pipe grinding work is more stable; and the clamping ring can be fixed in the fixing base through the nuts and the screw rods so that the clamping ring can be prevented from shifting.

The invention discloses an agricultural unmanned aerial vehicle takeoff and landing platform based on elastic series drivers. The unmanned aerial vehicle takeoff and landing platform adopts the elastic series drivers to replace traditional movement pairs, utilizes their elastic deformation to achieve transfer and conversion of movements and energy, flexible buffer in the descending process of agricultural unmanned aerial vehicles can be achieved, meanwhile the bounciness of the elastic drivers during descending of unmanned aerial vehicles can be also balanced, and vibration force is greatly weakened.

The invention provides an offset-proof cold press for processing decorative panels, which relates to the field of decorative panel processing machinery. The anti-offset cold press for processing decorative panels includes a body, a hydraulic rod is movably connected to the inside of the body, and a pressing plate is fixedly connected to the bottom of the hydraulic rod below the body. The lower surface is fixedly connected with a support leg, and the end of the support leg away from the body is fixedly connected with a bottom plate. The anti-deviation cold press for decorative panel processing drives the screw to rotate through the rotation of the motor to achieve the effect of the screw moving downward through the screw hole, and through the cooperation of the screw, the movable block and the slider to drive the anti-deviating plate to move downward And the effect of clamping the decorative panels that need to be compressed solves the problem that when the existing cold press is performing the compression work, the left and right sides between the two adjacent panels are easy to be uneven due to pressing, resulting in the damage between different panels. The pressure distribution is uneven, resulting in uneven pressing quality.

The invention provides a non-welded PHC pipe pile quick connecting method and a pulling-resistant quick installing structure. The pulling-resistant quick installing structure comprises pipe pile steel bars, steel bar head sleeves and quick connectors; the quick connectors of the steel bars of a pipe pile are perpendicularly and fixedly connected to the quick connectors of the steel bars of another pipe pile in an inserted mode; the quick connectors comprise the male quick connectors and the female quick connectors, when the quick connectors are fixedly connected in an inserted mode, the male quick connectors are perpendicularly inserted into the female quick connectors from inserting openings to push out rolling balls into inserted connection fixing cavities, and the rolling balls fall to the bevels of rolling ball releasing openings; when annular grooves formed in the stepped shaft small ends of the male quick connectors arrive at the bevels of rolling ball releasing openings, the rolling balls roll into the annular grooves, the annular groove walls and the bevels of rolling ball releasing openings clamp and lock the rolling balls in the annular grooves under the gravity action of the pipe piles to form annular ball zones, the male quick connectors are fixedly hung on the female quick connectors through the annular ball zones formed on stepped shafts, and then the pipe piles are connected in a butt-joint mode through the quick connectors. According to the non-welded PHC pipe pile quick connecting method and the pulling-resistant quick installing structure, the stable high-strength non-welded pipe pile quick connecting structure can be provided in the PHC pipe pile connecting work, and corrosion and rust protection treatment is easy to conduct.

The invention relates to the technical field of sewage treatment, and discloses a sewage treatment device for collecting hair based on cam circulation type oscillation. The device comprises a shell, awater outlet is formed in the bottom of the right side wall of the shell, sliding blocks are fixedly connected to the left side and the right side of the top of the shell, sliding rods are slidably connected to the interiors of the sliding blocks, connecting frames are fixedly connected to the ends, away from the shell, of the sliding rods, and water inlet pipes are arranged in the connecting frames. The invention discloses the sewage treatment device for collecting hair based on cam circulating oscillation. By arranging a first spring, the oscillation force can be buffered; the filtering device is prevented from being damaged due to excessive vibration; the buffering cushion is of an arc-shaped structure, the radian of the buffering cushion is the same as that of the outer wall of the filtering device, the buffering cushion is made of rubber, the filtering device is prevented from being damaged due to the fact that hard objects collide with the filtering device through the bufferingcushion made of the rubber, and the attaching degree of the buffering cushion and the filtering device is increased through the buffering cushion of the arc-shaped structure.

The invention relates to a protective hat, in particular to a protective hat, which is capable of buffering harm and shock of external force to a head and keeping force balance of the head and a vertebral column in motion so as to protect the head and a neck during exercises, and relates to the technical field of clothing. The protective hat comprises a crank wheel connecting frame (1), an elastic V-shaped frame strap (2), a U-shaped piston and ring assembly (3), a W-shaped jaw support (4), a jaw support belt (5), a corrugated shaft connecting bar (6) and a connecting bar slide belt (7). By means of structural linkage and streamline form of the protective hat, air resistance is reduced and the shock and harm of the external force to the head are buffered during exercises, the force balance of the head and the vertebral column is kept during exercises, and the head and the neck are protected. The protective hat is made of aramid fabric high in shock resistance, ultrahigh polymer weight polyethylene, shock-absorbing and noise-reducing elastic rubber, and gel material quickly solidifying upon shock of the external force. The protective hat can be disassembled and assembled for replacing filling. The protective hat is suitable for sports, riding, driving and the like.

The invention relates to a special ultrasonic sterilization and disinfection device for a medical and surgical instrument. The special ultrasonic sterilization and disinfection device comprises a fixed table, wherein a base plate is arranged on the lower end face of the fixed table; four universal wheels are symmetrically arranged on the lower end face of the base plate; the special ultrasonic sterilization and disinfection device can be freely moved to a designated position through the four universal wheels below the base plate, and the simplicity and convenience in operation are realized; four parallel branched chains are symmetrically arranged on the upper end face of the fixed table; an operation board is arranged at the top ends of the four parallel branched chains; a fixed column is welded on the upper end face of the operating board; a fixed disk is welded on the upper end face of the fixed column; six fixing round holes are symmetrically arranged in the fixed disk; six sterilization lifting branched chains are respectively and fixedly arranged in the six fixing round holes. According to the special ultrasonic sterilization and disinfection device disclosed by the invention, the ultrasonic cleaning, sterilizing and disinfecting functions of the surgical instrument can be realized, the classified placement and quick taking functions of the surgical instrument can be also realized, the surgical progress is accelerated, and the working efficiency is improved; in addition, the special ultrasonic sterilization and disinfection device has the advantages of simplicity and convenience in operation, good sterilizing and disinfecting effects, adjustable lifting height and the like.

The invention relates to an anti-collision locking device special for the transportation of a logistics distribution unmanned aerial vehicle. The anti-collision locking device comprises a bottom plate, wherein four walking branched chains are symmetrically arranged on the lower end surface of the bottom plate; each of the walking branched chains comprises two mounting lugs which are symmetrically arranged on the lower end surface of the bottom plate; a rotating shaft is mounted between every two mounting lugs through a bearing; a walking wheel is mounted in the middle part of each of the rotating shafts through a key, and one end, close to the side wall of the bottom plate, of each rotating shaft is connected with an output shaft of each walking motor through a corresponding coupling; the walking motors are mounted at the lower end surface of the bottom plate through motor seats; the rotating shafts are driven by the walking motors to rotate; the walking wheels are driven by the rotating shafts to rotate; and the bottom plate is driven by the walking wheels to move. According to the anti-collision locking device disclosed by the invention, the walking motors on the four walking branched chains are separately controlled to operate the bottom plate to move in a specified direction, the anti-collision and locking transportation functions of the logistics distribution unmanned aerial vehicle can be realized, and the anti-collision locking device disclosed by the invention has the advantages of being free from manual taking, good in anti-collision performance, good in locking performance and the like.

The invention discloses a building construction supporting device with a damping function. The building construction supporting device comprises a base, wherein a concrete reinforcing layer is arranged on the inner side of the base; an outer sleeve is arranged on the inner side of the concrete reinforcing layer; an inner sleeve column matched with the outer sleeve is arranged on the inner side ofthe outer sleeve in a sleeving mode; a fixing seat is arranged in the middle of the top of the inner sleeve column; a sleeve is arranged in the middle of the interior of the fixing seat; an inner sleeve matched with the sleeve is arranged on the inner side of the sleeve in a sleeving mode; and a spring A connected with the sleeve is arranged at the bottom of the inner sleeve. According to the building construction supporting device with the damping function, through sleeving connection of the outer sleeve and the inner sleeve column, during attaching supporting of the device, a pressing damping assembly and an attaching damping assembly are combined with each other and matched in a linkage mode, so that the supporting effect and strength of the device are greatly improved, impact force andvibration force which are generated during supporting are relieved, the overall structural strength of the device is enhanced, and the buffering function and the compression resistance effect of thedevice are improved.

The invention discloses a material lifting device for building engineering construction and using method thereof. The material lifting device for the building engineering construction comprises a baseand a transportation box, wherein supporting rods are arranged on the four corner positions of the base, a supporting table and a top plate are arranged on the upper parts and the tops of the four supporting rods correspondingly, second sliding rails are arranged on two supporting rods on the same side of the four supporting rods correspondingly, first sliding rails are connected on the upper parts of the second sliding rails, the transportation box is arranged on the second sliding rails, a traction device is arranged on the top plate and is connected with the transportation box, supportingplates are arranged between the supporting table and the top plate, electric push rods are connected to one sides of the supporting plates, sliding plates are connected to one side of the electric push rod, and the side walls of the sliding plates are fixedly connected with the first sliding rails. The material lifting device for the building engineering construction and the using method thereof are novel in structure and convenient to operate, by arranging the supporting table, the electric push rods, the sliding plates and the first sliding rails, materials can be pushed to transversely movethrough the electric push rods when conveyed to a high position, unloading of the materials is facilitated, the working efficiency is greatly improved, and the practicability of the device is improved.

The invention relates to the technical field of forging equipment, and discloses high-safety rapid forging equipment. The high-safety rapid forging equipment comprises a forging table. According to the high-safety rapid forging equipment, by arranging a damping mechanism, when a forging sleeve hammers a forged piece, the impact force on the ground is effectively offset, the ground is effectively protected, and meanwhile, the counter-vibration force of the ground to the device is reduced, and the service life of the device is prolonged; by arranging a safe forging mechanism and a cleaning mechanism and by arranging a cleaning plate, an electric lifting rod is used for lifting a mounting plate, a second rack is engaged with the surface of a gear, a cleaning plate pushes the forge piece and waste chips into a cooling box while a forging column is lifted, manual contact is not needed in the whole process, and therefore, the problems that people are scalded by the forge pieces, stabbed by the waste chips and the like are effectively avoided; by arranging a circulating cooling mechanism, the forged piece can be rapidly cooled and subjected to surface cleaning after being forged; and cooling liquid is separated from the waste chips, so that the cooling liquid can be recycled.

The invention discloses a protecting device for bodybuilding. The protecting device comprises a running belt; a mounting frame is welded to the outer wall of the bottom of the running belt; a supporting column is connected to the outer wall of one side of the top of the mounting frame through a bolt, a mounting hole is formed in the outer wall of the other side of the bottom of the supporting column, a microprocessor is connected to the inner wall of the mounting hole through a screw, an alarm is connected to the outer wall of the other side of the supporting column through a screw, the alarmis located above the microprocessor, a display control screen is connected to the outer wall of the top of one side of the supporting column through a bolt, the display control screen is located abovethe alarm, the outer walls of the two ends of the top of the mounting frame are each connected with a stretchable column through a bolt, and the stretchable columns are located between the supportingcolumn and the running belt. By arranging the safety protecting belt and hook and loop fasteners, the waist of a person can be wrapped, the phenomenon that people fall down due to the fact that feetskid or a running machine breaks down is avoided, and exercising people are protected.

The invention relates to the field of industrial machines, in particular to damping equipment of a motor base. The damping equipment comprises a bottom plate. The top of the bottom plate is fixedly connected with a fixing block, a groove is formed in the top end of the fixing block, the inner side of the groove is slidingly connected with a convex block, the top of the convex block is fixedly connected with a mounting plate, a damping cushion is arranged on the top of the mounting plate, a buffer mechanism is arranged at the bottom of the convex block, and connecting mechanisms for connectingthe mounting plate and the fixing block are arranged at the left end and the right end of the fixing block. As the buffer mechanism is arranged, vibration force caused by a motor can be effectively relieved, the problem that the vibration force generated when the motor runs is very serious is solved, and the service life of the motor and a mounting seat is prolonged; as the connecting mechanisms are arranged, the device is conveniently mounted, and meanwhile, as first springs are arranged, the damping effect of the device can be enhanced; and as the damping cushion is arranged, due to the composite structure of metal and rubber, the strength and the damping capacity of the damping cushion are enhanced.

The invention discloses an injection packaging box with a buffer function. The injection packaging box comprises a box body, a medicine bottle clamping plate is arranged in the box body, first spongeblocks are arranged in medicine placing slots correspondingly, second sponge blocks are arranged in front of the first sponge blocks correspondingly, pressing plates are arranged in front of the second sponge blocks correspondingly, one ends of hinge shafts are welded and fixed to the medicine bottle clamping plate, the other ends of the hinge shafts are welded and fixed to the pressing plate, theright sides of the medicine placing slots are provide with cavities, inserting strips are arranged at the upper and lower ends of the right sides of the pressing plates, the middles of the other endsof the inserting strips are provided with a clamping plate, push blocks are arranged behind the other ends of the inserting strips, and the tail ends of the push blocks are welded and fixed to the inner walls of the cavities. A glass bottle is effectively protected, a user can conveniently take the glass bottle out of the box body, the packaging box is repeatedly used, and resources are saved.

The invention discloses a machining device for producing spare and accessory parts of textile machinery. The machining device for producing the spare and accessory parts of the textile machinery comprises a device body, wherein the device body is of a cavity structure. Landing legs are arranged on both sides of the bottom of the device body, movable ports are formed in both sides of the bottom ofthe device body, a movable bracket is arranged at the middle position inside the device body, and a bidirectional motor is arranged on the outer wall of one side of the movable bracket. Positioning plates arranged horizontally are installed at the bottoms of the two sides of the movable support, guide vertical rods are welded to the bottoms of the positioning plates, and the guide vertical rods are sleeved with springs. The movable bracket is internally connected with a threaded cross bar and a sliding cross bar, wherein one end of the threaded cross bar is connected with an output shaft of the bidirectional motor, and two moving vertical plates are arranged between the threaded cross bar and the sliding cross bar. The design is reasonable, the spare and accessory parts with different specifications can be quickly positioned, and at the same time, shaking force suffered by producing the spare and accessory parts of the textile machinery is alleviated, and processing precision and efficiency can be effectively improved.

The invention relates to a transporting device used for a pesticide spraying unmanned aerial vehicle. The transporting device comprises a base plate. Four shock absorption branch chains are symmetrically arranged on the upper end face of the base plate and have the good shock absorption performance. An operation table is installed on the upper end faces of the four shock absorption branch chains. Four locking branch chains are symmetrically arranged on the upper end face of the operation table, can achieve the function of automatically locking the pesticide spraying unmanned aerial vehicle which takes off or lands and have the good locking performance. Each shock absorption branch chain comprises a lower lug seat installed on the upper end face of the base plate. A shock absorber is connected to the middle of each lower lug seat through a pin shaft. The upper end of each shock absorber is connected to an upper lug seat through a pin shaft. Each upper lug seat is installed on the lower end face of the operation table. By the adoption of the transporting device, the problem that an existing pesticide spraying unmanned aerial vehicle needs to be taken and transported manually in the take-off and landing process, locking equipment is not available, and consequently the existing pesticide spraying unmanned aerial vehicle is impacted and damaged can be solved, and the transporting device can achieve the locking and transporting functions of the pesticide spraying unmanned aerial vehicle and has the beneficial effects of being easy and convenient to operate, good in locking performance, good in stability performance and the like.

The invention discloses a multifunctional wall grooving machine. A fixed base is included, and universal self-locking wheels are arranged at the bottom of the fixed base; a control device is arrangedon the outer side of the fixed base, and a pushing handle is arranged at one end of the fixed base, and fixedly welded to the fixed base; an adjusting plate is fixedly arranged above the fixed base, and a limiting block is arranged at the top end of the adjusting plate which is provided with a slide rail and a guide rail device; the slide rail and the guide rail device are in sliding connection; adriving motor is arranged on the inner wall of the fixed base, and is connected with the slide rail and the guide rail device; the adjusting plate is provided with a movable frame which is fixedly connected with the guide rail device; the side, away from the adjusting plate, of the movable frame is fixedly connected with a connection block; and the other side of the connection block is provided with a grooving machine head which comprises a rotating shaft and a saw blade. The structure is adopted for the multifunctional wall grooving machine, it can be avoided that an operator holds the grooving machine in the hand, the labor intensity can be relieved, the situation that cement powder is splashed everywhere can also be prevented, and the work efficiency is improved.

The invention discloses an agricultural unmanned aerial vehicle takeoff and landing platform based on elastic series drivers. The unmanned aerial vehicle takeoff and landing platform adopts the elastic series drivers to replace traditional movement pairs, utilizes their elastic deformation to achieve transfer and conversion of movements and energy, flexible buffer in the descending process of agricultural unmanned aerial vehicles can be achieved, meanwhile the bounciness of the elastic drivers during descending of unmanned aerial vehicles can be also balanced, and vibration force is greatly weakened.

The invention discloses an anti-vibration explosion-proof detector. The detector comprises a support, the top of the support is fixedly connected with a top plate, the top plate is provided with two sliding holes, each sliding hole is internally connected with a suspender in a sliding mode, the lower ends of the two suspenders are jointly and fixedly connected with a hanger plate, a first spring is fixedly connected between the hanger plate and the top plate, and the suspender is sleeved with the first spring. Two vertical plates are fixedly connected to the upper side of the hanger plate; a guide hole is formed in one side of each vertical plate; a guide rod is slidably connected in each guide hole , a box body is fixedly connected between the two guide rods, a detector body is arranged in the box body, an opening is formed in one side of the box body, a tempered glass plate is arranged at the opening, a second spring is connected to outer side of the guide rod in a sleeving manner, and the second spring is fixed between the box body and the vertical plate. The detector has the advantages that the vibration force borne by the box body can be relieved, so that the detector body works in a relatively stable environment, the detection accuracy is ensured, and the service life of the detector can be prolonged.

The invention provides a damping and noise reduction motor, and relates to the field of motors. The damping and noise reduction motor includes a motor body, a motor body seat is fixedly connected to the bottom of the motor body, a supporting plate is connected to the lower surface of the motor body seat in an overlapped mode, and a buffer groove is formed in the upper surface of the supporting plate. A bracket is fixedly connected the lower surface of the motor body seat and located in the buffer groove, a wheel shaft is fixedly connected to the end, away from the motor body seat, of the bracket, a connecting plate is fixedly connected to the left side of the bracket, a side plate is connected to the left side of the supporting plate in an overlapped mode, and a bottom plate is fixedly connected to the bottom of the side plate. The damping and noise reduction motor achieves the effect that the motor body moves when the motor body vibrates by the cooperation between the bracket, the wheel shaft and a roller, and the effect of buffering the vibration force of the motor body by a compression spring is achieved by the movement of the connecting plate; and a fixing rod is arranged inside a fixing hole, the bottom plate can be fixed, and the motor is fixed.

The invention relates to the technical field of air compressors, in particular to an efficient energy-saving air compressor which comprises an air compressor body and a shell, the air compressor bodyis placed in the shell, an opening is formed in the top end of the shell, a sealing cover is arranged at the position of the opening in the top end of the shell in a matched mode, and a plurality of evenly-distributed air outlet pipes are arranged on the sealing cover in a penetrating mode; a transverse plate is arranged in the shell, the air compressor body is arranged on the transverse plate through a fixing mechanism, a plurality of evenly-distributed telescopic rods are fixedly welded between the transverse plate and the bottom end of the interior of the shell, the telescopic rods are sleeved with buffer springs, and the two ends of each buffer spring are fixedly connected with the bottom of the shell and the bottom face of the transverse plate correspondingly; and an air bag is fixedly bonded between the transverse plate and the bottom of the shell, and hoses are fixedly connected to the two sides of the air bag in a penetrating mode. According to the efficient energy-saving air compressor, the defects that in the prior art, an electric fan needs to be additionally designed for accelerating heat dissipation of an existing air compressor, and energy needs to be additionally consumed are overcome, the beneficial effect is obvious, and the air compressor is suitable for popularization.