49results about How to "Avoid secondary blockage" patented technology

The invention provides a method for cleaning a three-way catalyst without demounting the three-way catalyst. The method includes the steps that water is input from an oxygen sensor to conduct spray-wash on the three-way catalyst; cleaning liquid is input from an air inlet of the oxygen sensor to conduct spray-wash on the three-way catalyst washed with water, wherein the cleaning liquid comprises 3wt%-8wt% of tartaric acid, 5wt%-10wt% of citric acid, 8wt%-18wt% of glacial acetic acid, 3wt%-6wt% of malic acid, 10wt%-50wt% of scale and corrosion inhibitor, 0.06wt%-0.20wt% of EDTA and 15wt%-50wt% of deionized water; water is input from the air inlet of the oxygen sensor to conduct secondary water wash on the three-way catalyst which is washed with the cleaning liquid. By the utilization of the cleaning liquid and the combination of water and the cleaning liquid input from the air inlet of the oxygen sensor, the three-way catalyst can be cleaned, and the cleaning effect is good.

The invention discloses a raft built-in dewatering structure, a sealing-well structure of a dewatering well and a sealing-well method, and relates to the technical field of the building construction.The raft built-in dewatering structure is arranged at the bottom of a foundation pit, and comprises a drainage ditch, a water collection pit, a well pipe, a water pump, an outer drainage pipe and electric wires, wherein the well pipe comprises a sand-free filter pipe and a water guide pipe, the sand-free filter pipe is embedded in the water collection pit, the top of the sand-free filter pipe is lower than the upper surface of the drainage ditch, the water guide pipe is arranged on the top of the sand-free filter pipe, the top of the water guide pipe exceeds the upper surface of the drainage ditch, and the top of the water guide pipe is provided with a cover plate in a covered mode. According to the raft built-in dewatering structure, the technical problems that the dewatering well is arranged at a local ponding position, sealing is conducted before concrete pouring of a base plate, then the base plate construction is conducted, if the surface water level is high and the water volume is large, the concrete pouring can not be conducted in time when sealing is conducted, resulting in a base plate cushion layer and a waterproof and protective layer being buoyed by the buoyancy of groundwater due to sealing, thus the base plate cushion and the waterproof and protective layer are destroyed are solved.

The invention provides an amniotic-membrane lacrimal passage repair support which comprises an amniotic-membrane support body made from an amniotic membrane subjected to freeze drying treatment and amedical suture connected to two ends of the amniotic-membrane support body. The length of the amniotic-membrane support body between two suture nodes is slightly larger than the length of the medicalsuture between the two ends of the amniotic-membrane support body. During traction of the amniotic-membrane lacrimal passage repair support, the amniotic-membrane support body is not stressed, it is ensured that the amniotic-membrane lacrimal passage repair support does not break in the lacrimal passage, easily adapts to a zigzag structure of the lacrimal passage, secondary blockage caused by thefact that pulling friction causes damage and adhesion of the lacrimal passage tissues, and meanwhile the amniotic-membrane support body has the very good treating effect on lesion tissues, is conductive to restoration of the epithelium structure and functions of the lacrimal passage, prevents scar formation and is high in efficiency, good in long-term effect and low in relapse rate. The amniotic-membrane support body can be degraded after being implanted without reoperation for removal, can be stored at normal temperature for a long time, is convenient to transport and can meet the clinic demand at any time.

The invention provides a clay anti-swelling stabilizer which is prepared from the following raw materials by weight percent: 65-80% of BH-2018 surfactant, 1-15% of sodium alginate, 1-10% of glycol, 5-15% of KCl and 10-28% of glycerol. The clay anti-swelling stabilizer is wide in raw material source, less in production consumed energy, low in cost, high in anti-swelling efficiency and comprehensive in mechanism, and has the effect of improving recovery efficiency. When 1% clay anti-swelling stabilizer is used for injection, the anti-swelling property can achieve more than 85%. The invention also provides a preparation method of the novel clay anti-swelling stabilizer.

The invention discloses an anti-water-accumulation floor drain. The floor drain comprises a shell, a connection pipe is communicated with the lower end of the shell, and a thread is arranged at the exterior of the connection pipe; a first annular groove is formed in the upper end of the inner side wall of the shell, a cover plate is arranged at the upper end in the shell, and each end of the coverplate extends in the first annular groove. The anti-water-accumulation floor drain has the advantages that a second water outlet mechanism can be automatically started when a filter plate is blocked,so that accumulated water enters the shell from the edge of the upper end of the shell, the accumulated water flows out from the shell and the connection pipe through a filter cover, and accordinglystable drainage of the floor drain continues; since the area of the opening of the upper end of the shell is larger than that of the filter plate, the drainage flower is increased, the drainage efficiency is improved, and the drainage function and the filter function achieve a balance; the filter cover can filter impurities to the greatest degree during effective drainage, secondary blocking is avoided, and the floor drain can be used multiple times and is convenient and easy to use and install again.

The invention belongs to the technical field of natural gas pipeline cleaning, and particularly relates to a pipeline pig special for cleaning up the blockage of the hydrates in a natural gas pipeline. The pipeline pig can be used for cleaning up the hydrates in the natural gas pipeline and has the self-blocking-removing function. The pipeline pig is composed of two separate components which can be used separately or in an assembled mode and comprises a friction system, a raw lime heating gas system, a safety system, and a backup power unit, the chisel function of the friction system can be used for cleaning up the sedimentation of the hydrates that do not completely blocks the circulation area and are attached to the pipe wall, and the cutting function of the friction system can be combined with the continuous friction function of the raw lime heating gas system so as to be capable of dealing with the hydrate blocking segment that completely blocks the circulation area. The pipeline pig has the advantages of being direct, thorough, easy to operate and economic and the like in dealing with various problems of the hydrate blockage in the natural gas pipeline.

The invention relates to a pipe dredging device comprising a dredging mechanism, a machine body, a moving mechanism, a sensing mechanism, a fixing mechanism and a transmission mechanism. The dredgingmechanism, the moving mechanism, the sensing mechanism, the fixing mechanism and the transmission mechanism are all arranged on the machine body, the dredging mechanism is used for dredging a pipe soas to remove blockage, the moving mechanism is used for moving the device in the pipe, the sensing mechanism is used for detecting the environment inside the pipe, the fixing mechanism is used for fixing the device inside the pipe, and the transmission mechanism is used for transporting the blockage to the outside. A drill bit is used for drilling and crushing the blockage, the blockage flows intothe machine body through a groove, and therefore no blockage is left, and the condition that the interior of the pipe is blocked by the blockage again in the future is avoided.

The invention discloses an intelligent bin clearing and flow assisting device of an inverted conical steel barrel material bin and a use method thereof. The intelligent bin clearing and flow assistingdevice is composed of an air source system, a control air path system, a flow assisting air path system, an injection mechanism and an electric control system. The injection mechanism comprises a nozzle (21), a pneumatic butterfly valve (19), and a working air path annular branch pipe (20), wherein the working air path annular branch pipe (20) is arranged outside the inverted conical steel barrelmaterial bin (22) in a layered manner from top to bottom, and a spray pipe of the nozzle (21) comprises a material bin central injection pipe and a parallel material bin inner wall oblique downward injection pipe. The use method has both manual control and automatic control, and can also be connected to a central control room of a production area for networking control. The device has the characteristics of high bin clearing efficiency, stable working performance, simple and convenient repair and maintenance and the like, completely eradicates potential safety hazards caused by manual clearing, simultaneously can reduce opening and idling time of equipment such as crushing and ball milling, saves the production cost, and is obvious in economic benefit.

The invention discloses equipment for dredging a domestic sewer. The equipment includes several flexional shafts, pipe bodies, a dredging structure, a drive device, and a conveying structure, whereinevery two adjacent shafts are detachably connected, the pipe bodies are arranged in the shafts and used for conveying liquid and gas, the dredging structure is used for pushing objects causing blockaging in a sewer pipeline, the drive device is used for driving the dredging structure to move front and back, and the conveying structure cooperates with the drive device and contains an agent used fordissolving one part of the objects causing blockaging. By arranging the conveying structure, at the time of dredging the sewer pipeline, the conveying structure can effectively convey liquid in the pipeline, a pipeline dredger, water or a mixture of the dredger and water can be conveyed into the pipe body in the process, the dredging effect of the sewer pipeline is improved in the dredging process, and the cleaning effect on the inner wall of the sewer pipeline is good.

The invention discloses a thrombus thrombolysis and aspiration device. The thrombus thrombolysis and aspiration device comprises an aspiration catheter and a thrombolysis catheter arranged in the aspiration catheter; through cooperation of the aspiration catheter and the thrombolysis catheter, the invention achieves flushing and aspirating on the stubborn thrombus, and a thrombus removal effect isimproved; according to the invention, a first balloon is arranged on the aspiration catheter, a second balloon is arranged on a thrombolysis flushing cavity of the thrombolysis catheter, and the blood vessel is blocked and sealed through inflation, so that blockage of the far-end blood vessel caused by exfoliated thrombus or tiny thrombus is prevented, secondary blockage is avoided, and the use safety of the device is improved.

The invention belongs to the technical field of medical instruments, and particularly relates to a thrombectomy device for a transcatheter pulmonary artery thrombectomy system. A thrombectomy device for a transcatheter pulmonary artery thrombectomy system comprises a thrombectomy support. The guide head is positioned at the far end of the thrombectomy stent; the thrombectomy stent is made of a wire harness and provided with meshes, and the meshes are of a gradually-changing structure with the far end being dense and the near end being sparse. The far end of the push rod is fixedly connected to the near end of the thrombectomy stent, and the push rod wraps the near-end wire harness of the thrombectomy stent; the pull tube is located in the thrombectomy support, the near end of the pull tube penetrates through the thrombectomy support and extends to the operation end of the thrombectomy system, and the far end of the pull tube is fixedly connected to the guide head; when the pull tube axially moves, the thrombus extraction support and the guide head are driven. The parts are simple and convenient to connect and fix, the deformation problem of the thrombus extraction stent is greatly reduced, the thrombus extraction stent has a good expansion state, thrombus can be grabbed to the maximum extent, the thrombus can be easily gathered, contraction deformation is buffered when the thrombus extraction stent is withdrawn, and loss of the thrombus is avoided.

The invention discloses a continuous feeding and discharging sintering rotary furnace. The continuous feeding and discharging sintering rotary furnace comprises a feeding bin, a feeder, a main frame,a furnace tube, a furnace head cover and a furnace tail cover, wherein the furnace tube is supported on the main frame; the furnace head cover and the furnace tail cover are arranged at the head end and the tail end of the furnace tube correspondingly; the feeder is arranged at a furnace head of the furnace tube and penetrates the furnace head cover to be in butt joint with the furnace tube; a first-level hopper and a second-level hopper are arranged in the feeding bin; a crushing roller couple is arranged between the first-level hopper and the second-level hopper; an outlet of the second-level hopper is in butt joint with the feeder; at least one material raising area and at least one material blocking area are arranged in the furnace tube and are alternately arranged at intervals in theaxial direction; each material raising area is provided with a plurality of circles of material raising plates, and each circle of material raising plates are provided with the multiple material raising plates arranged at intervals in the circumferential direction; and each material blocking area is provided with a first material blocking plate and a second material blocking plate, wherein the first material blocking plate and the second material blocking plate are oppositely arranged on the inner wall of the furnace tube, and a certain distance exists between the first material blocking plateand the second material blocking plate in the axial direction. The continuous feeding and discharging sintering rotary furnace has a crushing function, material overturning is sufficient, and the sintering time is accurate and controllable.

The invention belongs to the technical field of medical instruments, and particularly relates to a transcatheter pulmonary artery thrombectomy device and a thrombectomy system. The transcatheter pulmonary artery thrombus extraction device comprises a thrombus containing cavity used for obtaining thrombus; the thrombus containing cavity has flexibility and can be in an expansion state or a contraction state, the far end is of a closed structure, and the near end is of a folded structure; the transcatheter pulmonary artery thrombus extractor further comprises a pushing rod which is detachably connected with the folding structure of the thrombus containing cavity. A part of the guide piece is located in the pushing rod and can move in the axial direction of the pushing rod, and the far end of the guide piece penetrates out of the far end of the pushing rod and is connected with the far end of the thrombus containing cavity; when the guiding piece moves towards the far end in the axial direction of the pushing rod, the thrombus containing cavity is gradually in a contraction state, and when the guiding piece moves towards the near end in the axial direction of the pushing rod, the thrombus containing cavity is gradually in an expansion state. The thrombus containing cavity of the thrombus extraction device has flexibility and can be in an expansion state or a contraction state, the length of the thrombus extraction device is reduced, and the thrombus extraction success rate is increased.

The invention belongs to the field of municipal decontamination, and relates to municipal sewer dredging and decontamination equipment which comprises a shell and is characterized in that a sewer dredging device and a blocked garbage collecting device are arranged in the shell, a separation cavity is formed in the shell, a separation disc is arranged in the separation cavity in a sliding mode, and the separation disc is connected with the sewer dredging device and the blocked garbage collecting device in a sliding mode. A blocking garbage collecting device is arranged on the partition cavity, a sliding cavity is formed in the blocking garbage collecting device, a guide block is fixedly arranged in the sliding cavity, and a sewer dredging device is arranged on the guide block in a sliding mode. The sewer dredging device can dredge a sewer blocked by various kinds of dirt, meanwhile, the blocked dirt is collected, secondary blocking is avoided, after dredging of the blocked position is completed, the blocked garbage collecting device can stretch out in time, the problem that garbage is scattered excessively and is inconvenient to collect due to too long time is solved, and the sewer dredging device is suitable for popularization and application. And secondary blockage caused by scattered garbage is prevented.

The invention relates to the technical field of indoor sanitary pipelines, and discloses a pipeline dredging agent auxiliary reaction device which comprises a pipe body. A supporting block is fixedlymounted in the pipe body, a main disc is fixedly connected to the supporting block through a rotating shaft in a clamped manner, a sliding groove is formed in the eccentric position of the main disc,and a connecting pin is slidably connected to the interior of the sliding groove in a clamped manner. The outer wall of the lower end of the connecting pin is rotationally connected with an eccentricdisc in a sleeved manner. According to the pipeline dredging agent auxiliary reaction device, through the arrangement of a base disc, an action disc, a clamping groove, a triangular plate, a water discharging groove, a lower clamping block, limiting grooves and an upper clamping block, a dredging agent is blocked, so that the contact time of the dredging agent and an obstacle is long enough, and the pipeline is easy to dredge; and through the arrangement of the supporting block, the rotating shaft, the main disc, the sliding groove, the connecting pin, the eccentric disc and a bearing interlayer, large obstacles generated after dredging are crushed, secondary blockage of the pipeline is prevented, the pipeline dredging effect is good, and the pipeline dredging efficiency is high.

The invention provides an oilfield barium / stronium scale cleaning blockage remover composition which is prepared from the following raw materials in parts by weight: 20-25 parts of amino acetamide, 33-37 parts of 3-amino-1,2,4-triazole, 10-14 parts of crown ether (18-crown-6), 13-16 parts of sodium dihydroxytartrate, 6-9 parts of ethosuximide, 9-11 parts of N-hydroxyethylamino-diacetic acid, 1-3 parts of ethyl undeeylenate, 11-15 parts of hydroxypropyl ethyl ether, 30-35 parts of ammonia water, and 70-80 parts of water. The composition is used for removing blockage of a rod pumped well, a screw pump well and a stratum; scales of barium sulfate, strontium sulfate, barium carbonate, strontium carbonate and calcium sulfate and the like generated in a water injection system can be quickly dissolved. Blockage removal of a mechanical recovery well and the stratum can be completed within 4-8 h usually, the descaling rate is 98% or higher, descaling and blockage removal of barium / stronium scales of the mechanical recovery well and the stratum can be completed by a one-step method, and waste liquor after cleaning is degraded easily and does not flow back to the ground for treatment, therefore, non-corrosive and safe blockage removal is achieved.

The invention provides a barite pollution blockage remover composition of an oil-gas well of an oilfield. The composition is prepared from the following raw materials in parts by weight: 20-25 parts of acetone semicarbazon, 16-20 parts of 5-carboxylic acid-3-amino-1,2,4-triazole, 13-16 parts of L-sodium aspartate, 3-5 parts of crown ether (18-crown-6), 7-10 parts of phenyl diethyl malonate, 11-15 parts of dimethylethanolamine, 33-37 parts of ethosuximide, 9-13 parts of iminodiacetic acid, 30-35 parts of ammonia water (40 wt%) and 70-80 parts of water. The blockage remover composition is used for removing blockage of a stratum with barite pollution in drilling mud; the blockage removal speed is high, and the blockage removal of barite pollution in the oil-gas well can be completed within 4-12 h, and therefore, the yield of the oil-gas well of the oilfield is recovered and improved; the descaling rate is 98% or higher, and the blockage removal of barite pollution in the oil-gas well of the oilfield is completed by a one-step method; the safe and non-corrosive blockage removal is achieved; no corrosion, no dead angle, no precipitation or no secondary well clogging are caused; 90% or more of barite mud pollution can be effectively removed.

The invention discloses a drill rod centralizer. The drill rod centralizer comprises a centralizing wing, an upward flow channel and a through hole, wherein a conical part is arranged in the through hole in a sealing fit mode, and the conical part is connected with the hole wall of the through hole through a first shear pin; the drill rod centralizer further comprises a sliding sleeve, the slidingsleeve is connected to the inner wall of the centralizer in a sealing mode, a one-way valve is arranged at the bottom of the sliding sleeve, and the sliding sleeve is connected with the centralizer through a second shear pin; a first pressurizing flow channel and a second pressurizing flow channel are formed in the inner wall of the centralizer, and a third pressurizing flow channel is further formed in a sliding push block; when the sliding sleeve moves downwards to a low stroke position, the upper end of the first pressurizing flow channel is located outside the sliding sleeve; when the sliding push block moves downwards to the low stroke position, the second pressurizing flow channel communicates with the third pressurizing flow channel; and a plurality of spiral blades are further arranged at the end, away from the pointed cone end, of the conical part. The drill rod centralizer is used for solving the problem that in the prior art, a drill rod centralizer is prone to mud drum andthen underground accidents are induced, and the purposes of providing a self-unblocking function for the drill rod centralizer and reducing the risk of jamming of a drill by the mud drum of the centralizer are achieved.

The invention provides an amniotic-membrane lacrimal passage repair support which comprises an amniotic-membrane support body made from an amniotic membrane subjected to freeze drying treatment and amedical suture connected to two ends of the amniotic-membrane support body. The length of the amniotic-membrane support body between two suture nodes is slightly larger than the length of the medicalsuture between the two ends of the amniotic-membrane support body. During traction of the amniotic-membrane lacrimal passage repair support, the amniotic-membrane support body is not stressed, it is ensured that the amniotic-membrane lacrimal passage repair support does not break in the lacrimal passage, easily adapts to a zigzag structure of the lacrimal passage, secondary blockage caused by thefact that pulling friction causes damage and adhesion of the lacrimal passage tissues, and meanwhile the amniotic-membrane support body has the very good treating effect on lesion tissues, is conductive to restoration of the epithelium structure and functions of the lacrimal passage, prevents scar formation and is high in efficiency, good in long-term effect and low in relapse rate. The amniotic-membrane support body can be degraded after being implanted without reoperation for removal, can be stored at normal temperature for a long time, is convenient to transport and can meet the clinic demand at any time.

The invention discloses a thermal insulation waterproof sheet installation structure of a dry-hanging external wall and an installation method of the thermal insulation waterproof sheet installation structure. The thermal insulation waterproof sheet installation structure includes a shear wall external wall, a plurality of waterproof thermal insulation sheets spliced in the length direction and the width direction are installed on the outer side surface of the shear wall external wall, a plurality of vertical upward clamping bolts are arranged on the sides, close to the shear wall external wall, of the waterproof thermal insulation sheets, opposite-pulling installation holes are formed in the positions where the shear wall external wall corresponds the clamping bolts, the opposite-pullinginstallation holes penetrate through the thickness direction of the shear wall external wall, the clamping bolts are inserted into and penetrate out of the opposite-pulling installation holes, so thatthe waterproof thermal insulation sheets are closely attached to the outer side surface of the shear wall external wall, and the technical problem of large construction difficulty and poor mortar anti-cracking effect in the prior art are solved.

The invention belongs to the technical field of natural gas pipeline cleaning, and in particular relates to a pipe pig specially used for clearing natural gas pipeline hydrate blockage. This device can be used to remove hydrate blockages in natural gas pipelines, and has a self-blocking function. The pig is composed of two independent parts, which can be used separately or assembled. The pig includes a friction system, a quicklime heating gas system, a safety system, and a backup power unit. The chiseling function of the friction system can be used to clean the hydrate deposits that do not completely block the flow area and adhere to the pipe wall; the cutting function and continuous friction function of the friction system can be used in conjunction with the quicklime heating gas system to deal with the hydrate blockage section that completely blocks the flow area . The pipe pig of the present invention has the advantages of being direct, thorough, easy to operate, economical and the like in dealing with various problems of hydrate blockage in natural gas pipelines.

The invention relates to a cleaner, which comprises a cleaner barrel body, wherein the cleaner barrel body is provided with a filtering screen, the filtering screen is arranged vertical to the bottom of the cleaner barrel body, the cleaner barrel body is divided into two parts, namely, a non-filtering area and a filtering area, by the filtering screen, a partitioning plate is arranged at the lower part of the non-filtering part, and a gap between the partitioning plate and the filtering screen is 50-80mm; meanwhile, the partitioning plate keeps a downward inclined angle of 4-8 degrees, a dirt collecting pool is formed by means of the partitioning plate and the bottom of the cleaner barrel body, and a pipeline is arranged at the bottom of the cleaner barrel body of the dirt collecting pool part and is controlled by a backflush valve; and the cleaner is arranged in a whole inclination angle of 20-50 degrees. Because the cleaner is arranged in an inclined way, impurities and suspensions on the filtering screen have a self-cleaning capability under the impact of water flow, and flow into the specifically-designed dirt collecting pool, therefore secondary blockage caused by water flow perturbance is avoided, the water flow can be ensured to be unimpeded, the resistance loss is reduced, meanwhile, dirt can be cleared conveniently.

The invention discloses a PVC pipe dredging device and method, the PVC pipe dredging device structurally comprises a machine box, supporting legs, a handle, a pump machine connector, a fixing frame, a dredging device, a disc frame and a telescopic air pipe, the supporting legs are arranged on the left side and the right side of the bottom of the machine box, and the handle is vertically installed in the middle of the top of the machine box. The airflow enters the air nozzles in the direct flow pipe, and after the airflow is accelerated by the reducing holes, the jet-shaped air columns blow the inner wall of the pipeline to knock off blockages attached to the inner wall of the pipeline. A rotary removing device is installed at the bottom of a conduction device, a rotary blade on the rotary removing device is provided with a snagging drill bit, the snagging drill bit is of an olive-shaped spiral structure, under the action of airflow, the rotary blade enables the snagging drill bit to scrape hair cakes in a rotary drilling mode, the hair cakes are effectively crushed, scattered hair in a pipeline is hooked up by the snagging, and therefore the hair cakes are effectively removed. Secondary blockage caused by falling into a pipeline is prevented.

The invention discloses a household sewer dredging device, which comprises a plurality of bendable shaft parts, and two adjacent shaft parts are detachably connected; a pipe body arranged in the shaft parts is used for conveying liquid or gas; A dredging structure for opening the blockage in the sewer pipe; a driving device for driving the front and rear movements of the dredging structure. In the present invention, the traditional hose is arranged into a plurality of detachable shaft parts, and the shaft parts can be connected together during use, and the length that can be extended into the sewer pipe is extended, so the shaft parts can be effectively and accurately The dredging effect is good for dredging the blockage in the sewer pipe, and because the shaft is bendable, it can more effectively adapt to the bending of the pipeline and ensure that the shaft is in contact with the blockage.

The invention discloses an external sleeve-type serum blocking device for heart and cerebral vessels and belongs to the field of medical devices. The external sleeve-type serum blocking device comprises a vascular intervention device, wherein a balloon catheter is arranged at a right output end of the vascular intervention device; a vibration rod is arranged at the right side of the top of the balloon catheter; a puncture needle is arranged at the right end of the vibration rod; a through hole passes through an outer side wall of the puncture needle; a lens is arranged on an inner side wall ofthe puncture needle; a frame is arranged at the left side of the outer side wall of the balloon catheter; and springs are arranged at the top of the inner side wall of the frame. Through the cooperation of the vascular intervention device, the vibration rod, a metal support mesh, the balloon catheter and the puncture needle, vessel blockage can be effectively removed, so that secondary blockage of vessels can be prevented; and through the cooperation of the lens, a display, the frame, the springs and semicircular rings, the vessel blockage can be observed and the balloon catheter can be stabilized to reduce a surgical risk, so that the external sleeve-type serum blocking device is suitable for being widely promoted and used.