4848results about How to "Improve use reliability" patented technology

The invention discloses a nut cap of a tubular anastomat, belonging to a medical appliance. A sinking cavity is arranged in the inner end of a cap body and is internally provided with a backstop which is a bulge extending radially from the peripheral wall of the sinking cavity or a bulge extending axially from the bottom surface of the sinking cavity. The nut cap of the tubular anastomat is difficult to fall off from the rear end of an adjusting handle of the tubular anastomat and can improve the use reliability of the tubular anastomat.

A flexible display device includes a display panel and a plurality of curving-restricting structures. The display panel has a display surface and a bottom surface opposite thereto. The display surface has a visible region and an outer region surrounding the visible region. The curving-restricting structures may be disposed on at least one of the outer region of the display surface and the bottom surface of the display panel. Each curving-restricting structure has a top surface and at least a slanted side wall. The top surfaces of adjacent curving-restricting structures are spaced with each other, and the slanted side walls of adjacent curving-restricting structures face each other. When the flexible display device are curved to a predetermined extent, adjacent curving-restricting structures may resist against with each other to prevent the display panel from being unduly curved to be damaged, and thus a use reliability of the flexible display device is improved.

A flexible display device includes a display panel and a plurality of curving-restricting structures. The display panel has a display surface and a bottom surface opposite thereto. The display surface has a visible region and an outer region surrounding the visible region. The curving-restricting structures may be disposed on at least one of the outer region of the display surface and the bottom surface of the display panel. Each curving-restricting structure has a top surface and at least a slanted side wall. The top surfaces of adjacent curving-restricting structures are spaced with each other, and the slanted side walls of adjacent curving-restricting structures face each other. When the flexible display device are curved to a predetermined extent, adjacent curving-restricting structures may resist against with each other to prevent the display panel from being unduly curved to be damaged, and thus a use reliability of the flexible display device is improved.

The invention relates to a combined type rubber shock absorber and belongs to the technical field of rubber vibration isolators. The combined type rubber shock absorber is mainly used for vibration and buffering processing of electronic equipment or instruments. The combined type rubber shock absorber comprises a rubber anti-vibration pad, a rubber anti-vibration column, a metal limiting lining and a metal limiting gasket. According to the combined type rubber shock absorber, vibration and impact energy is translated into heat energy and deformation energy of rubber materials through the deformation of rubber parts by means of a combined shock absorber structure, the rubber anti-vibration pad is capable of reducing dynamic energy of an instrument with vibration to be isolated in the axial direction, the rubber anti-vibration column is capable of reducing dynamic energy of the instrument with the vibration to be isolated in the radial direction, the metal limiting lining and the metal limiting gasket are used in a matching mode, dynamic displacement of the shock absorber is limited due to the fact that the shock absorber is installed on a base plate of the instrument through bolts, and then an installation function and a limiting function are achieved.

The invention belongs to the technical field of using a counter-pressure casting technology to prepare a part and particularly relates to a counter-pressure casting technology of a hatch casting. The technology comprises the steps as follows: 1, ZL114A alloy chemical component is confected by weight percentage; 2, alloy is melted for thinning treatment and refining treatment, and alloy liquid is poured into a pot; 3, a counter-pressure casting machine is debugged and prepared; 4, a mold is preheated, a mold cavity is sprayed with dope, and the mold is matched; 5, counter-pressure casting technology parameter is set; compressed air is led into the mold cavity and the pot synchronously to adjust the pressure difference in the mold cavity and the pot; the alloy liquid is poured into the mold steadily to be solidified and crystallized for the casting under the action of the pressure difference; the casting is taken out after pressure relief; and a circulating process of counter-pressure casting lifting, mold filling, pressure maintaining and pressure relief is finished; 6, a counter-pressure casting hatch blank is obtained; and 7, heat treatment is carried out on the hatch blank. The invention has the advantages that the hatch blank which is manufactured by the counter-pressure casting technology has compact interior tissue of material and no casting flaw, obviously improves mechanical property and pressure endurance capability, and has good technical efficiency and low manufacturing cost.

The invention provides a mechanical arm, a working method thereof and a surgical robot. Convenience, safety and reliability of adjustment of the mechanical arm are improved. The mechanical arm comprises an adjusting arm and a tool arm which are connected; the tool arm comprises a plurality of tool arm joints which are used for adjusting postures of a surgical instrument at fixed points; the adjusting arm comprises a plurality of adjusting arm joints and motors for driving the adjusting arm joint to move, and is used for adjusting the positions of the fixed points; the mechanical arm further comprises a sensing unit and a control unit which are in communication connection; the sensing unit is used for sensing a Descartes acting force on the adjusting arm and providing sensing information tothe control unit; and the sensing unit is arranged at the tail end of the adjusting arm or the tool arm, the control unit is in communication connection with the motor for driving the adjusting arm joints, and is used for acquiring component forces or moments of the various adjusting arm joints through jacobi's transformation of force of the mechanical arm, and thus, the output states of the motors on the various adjusting arm joints are controlled.

The invention provides a fuse SMA (shape memory alloy) wire space connecting and disconnecting mechanism which is provided with a split nut, a tightening spring of the split nut and a release device of the tightening spring, wherein the release device of the tightening spring is two SMA wires, one end of the first SMA wire is connected with the upper end of the tightening spring of the split nut, the other end of the first SMA wire is connected with the upper end of an outer housing, and is tensioned under the action of the tightening spring, one end of the second SMA wire is connected with the other lower end of the tightening spring of the split nut, and the other end of the second SMA wire is connected with the lower end of the outer housing, and is tensioned under the action of the tightening spring. When the two SMA wires are heated by high current, a huge recovery stress is generated caused by the phase change in the two SMA wires, the fracture strength of the material can be reduced caused by high temperature, the two SMA wires are fractured under the combined action of the huge recovery stress and the reduced fracture strength, the restriction on the tightening spring can be released, the two SMA wires are backup mutually, the redundancy design can be realized, and the very high reliability can be guaranteed; and the connecting and disconnecting mechanism is thorough in unlocking, high in reliability, and good in vibration resistance and impact load resistance.

The invention discloses a multi-terminal industrial equipment inspection monitoring system and method based on a digital twinning technology, belongs to the technical field of intelligent manufacturing, and comprises a physical entity module, a visual interaction module, a data calculation module and a data transmission and feedback driving module. According to the invention, all state data in theindustrial equipment production process are extracted through the PLC; the OPCUA interface is used for transmitting the key data to the server; operation processing is carried out on the data by means of cloud service; augmented reality equipment, a PC and mobile terminal equipment are matched; mapping from an entity physical space to a digital space is realized; feedback control of the digital space on the entity physical space is realized. According to the invention, the visual inspection of the production state of the industrial equipment is realized, the problems of poor data visualization, poor data correlation and the like in the production and manufacturing process are solved, the data visualization degree and the data real-time feedback degree in the industrial manufacturing process are significantly improved, and the purposes of fault early warning and equipment data real-time visualization are achieved.

The invention provides a box cover locking device, which comprises an electromagnet. A permanent magnet is arranged on a box cover. The magnetic pole of the electromagnet is opposite to the magnetic pole of the permanent magnet, so that the box cover can be opened by the repulsion force generated between the electromagnet and the permanent magnet on the box cover when the electromagnet is powered on. When the electromagnet is powered off, the electromagnetic force of the electromagnet disappears, and an iron core of the electromagnet is attracted by the permanent magnet so that the box cover is closed. The box cover locking device has the advantages that the reliability in use of the locking device is improved since motion components, extra holes and plug-in and plug-out mechanisms are omitted; power consumption is reduced and the self-holding time of an automatic storage management system is prolonged by the aid of the design that the box cover is opened when the electromagnet is powered on and is closed when the electromagnet is powered off. The invention further provides a controllable storage box comprising the box cover locking device and a drug consumable storage system comprising the controllable storage box.

The invention relates to a full-automatic winding machine used for winding plastic tubes, aiming at simplifying the complicated structure of the winding machine and comprising a main-machine base, a rotary big arm arranged on the main-machine base, a tube-distributing mechanism and a tension control mechanism, wherein, two winding disks are symmetrically arranged on the rotary big arm, and after improvement, two winding-disk driving motors are symmetrically arranged on the rotary big arm and respectively connected with the two winding disks in a transmission way. The invention adopts the design of configuring driving sources respectively for the two winding disks to overcome the defects of complicated winding disk supporting and jointing devices, etc. existing by sharing one driving source, and the improvement reduces parts and reduces the manufacturing accuracy of the parts so as to simplify action program and distinctly enhance the reliability of equipment. The full-automatic winding machine of the invention improves the automation capability of plastic hose winding, enhances winding efficiency and is suitable for the automatic manufacturing line of various plastic hoses.

The invention discloses a three-dimensional (3D) printer which comprises a rack, a base, an X-axis movement system, a Y-axis movement system, a Z-axis movement system and a printing device, wherein the rack comprises a left upright post, a right upright post, an upper connecting plate and a lower connecting plate; the upper connecting plate and the lower connecting plate are connected with the left upright post and the right upright post, respectively; the base is connected with the lower connecting plate; the upper connecting plate is connected with a printing supplies connecting rack; the printing supplies connecting rack is connected with a printing supplies fixing disc; the printing device is connected with the X-axis movement system; the X-axis movement system is connected with the Z-axis movement system; the Z-axis movement system is connected with a guide rail of the left upright post and the right upright post; the Y-axis movement system is connected with the base; the X-axis movement system is provided with an X-axis movement guide rail through which the printing device moves; a power supply and a controller which are connected with each other are arranged at the bottom of the base; the controller is connected with the X-axis movement system, the Y-axis movement system, the Z-axis movement system and the printing device. The 3D printer is simple and compact in structure, small in size and low in manufacturing cost.

The invention provides a conductive fabric and a preparation method thereof. The conductive fabric comprises, from inside to outside, an adhesive force improving layer attached to the surface layer ofa fabric substrate, a liquid metal layer, an oxygen isolation protective layer and a packaging protective layer. The preparation method comprises: applying the adhesive force improving layer to the surface layer of a fabric substrate, coating the adhesive force improving layer with the liquid metal layer, coating the liquid metal layer with the oxygen isolation protective layer, and coating the oxygen isolation protective layer with the packaging protective layer. The coating manner includes spraying, brush coating, flow coating or printing. Compared with a conductive fabric in the prior art,the conductive fabric is excellent in conductivity, fold resistance, laundering durability and tensile property. The preparation method is simple and reliable.

The invention discloses a making method of high-purity solidified carbon cushion in the silicon crystal growing stove, which is characterized by the following: selecting flexible cushion with low metal impurity as blank material; disposing under high temperature to form graphite cushion; using graphite cushion as blank; solidifying the blank to shape with evenly permeable hardener; carbonizing the blank; proceeding chemical gas-phase deposition for blank; cutting part of element surface mechanically; disposing blank under high temperature; removing metal impurity and volatile substance; coating the working piece; strengthening the element surface; improving the corrosion resistant of blank surface.

The invention discloses a space positioning platform which comprises an X-direction guide rail, a Y-direction guide rail driven by an X-direction driving mechanism to be in linear reciprocating motion along the X-direction guide rail, a Z-direction guide rail driven by a Y-direction driving mechanism to be in linear reciprocating motion along the Y-direction guide rail, and a carrying platform driven by a Z-direction driving mechanism to be in up-down reciprocating motion along the Z-direction guide rail. The Y-direction guide rail is mounted on the X-direction guide rail , the Z-direction guide rail is mounted on the Y-direction guide rail, the carrying platform is mounted on the Z-direction guide rail, and the X-direction driving mechanism, the Y-direction driving mechanism and the Z-direction driving mechanism form a servo driving system for adjusting position of the carrying platform in directions X-axis, Y-axis and Z-axis of a space rectangular coordinate system. The space positioning platform is simple in structure, reasonable in design, simple and convenient to use and operate, good in using effect and high in positioning efficiency, and the problem that an existing lifting device is single in moving direction, inaccurate in positioning, poor in reliability and the like can be effectively solved.

The present invention discloses a strapdown inertial combination measurement control device applicable to all-fibre digital clinometer, it is used for measuring well course of oil well and gas well, in particular it is applicable to conventional measurement with line and measurement while drilling. Said control device adopts strapdown inertial navigation principle, and utilizes main navigation system formed from optical-fibre gyroscope and anti-vibration accelerometer, under the condition of different working environments and measurement accuracy requirements respectively utilizes several external information of logging cable rope length, flux-gate sensor and zero speed and combines kalman filter so as to make system error estimation and correction of main inertial navigation system, and can limit error diffusion of inertial navigation system and form a high-accuracy combination inertial measurement instrument.

A circuit structure and a fabrication method thereof manly use a plurality of wires to connect in series a plurality of pads to form a stretchable circuit. Each of the wires has a first end, a second end and an intermediate segment located between the first end and the second end, wherein the first end and the second end are respectively connected to different pads, and the position of the intermediate segment is higher than the positions of the first end and the second end. Since the connection manner of the wires and the pads has 3-D freedoms, the circuit structure can withstand both horizontal and vertical deformations and has an outstanding reliability.

The invention discloses a transfer robot for a warehousing stereoscopic garage. The transfer robot is characterized by comprising traveling wheels for moving in the front-back directions, moving driving mechanisms, a supporting trolley underframe, a lifting mechanism and retractable forked type automatic centering mechanisms. The moving driving mechanisms include a front moving driving mechanism and a rear moving driving mechanism and are respectively fixedly connected with two ends of the supporting trolley underframe, and the traveling wheels for moving in the front-back directions can be driven to rotate, so that the transfer robot can move in the front-back directions; the lifting mechanism comprises lifting frames, an electric push rod, gear cases, transmission racks and lifting guide columns, the electric push rod is fixedly connected with the transmission racks, gears in the three gear cases can be driven, and lifting racks further can be driven, so that the lifting frames can ascend and descend; front comb frames and rear comb frames of the automatic centering mechanisms can be driven by driving motors, chain transmission mechanisms, gear transmissions and retractable racks to be stretched out and drawn back, so that parking spaces can be centered, and centering combs can be stretched out and drawn back. The transfer robot has the advantages that the transfer robot is in a retractable forked type transfer structural design, accordingly, the utilization rate of clear spaces of the stereoscopic garage can be increased, the quantity of equipment can be reduced, and the service cost can be lowered.

The invention relates to a high-hardness ceramic composite material of boron carbide-titanium boride-silicon carbide and a preparation method thereof, and belongs to the technical field of a ceramic material. The composite ceramic is prepared from boron carbide, silicon carbide and silicon powder in a hot-pressing sintering manner via reaction. The composite ceramic contains 50-90wt% of boron carbide, 27-5.4wt% of titanium boride and 23-4.6wt% of silicon carbide. The defects of overhigh sintering temperature, and difficulty of improvement of the toughness and the hardness at the same time of the existing boron carbide ceramic are solved; carbon generated by reaction of the boron carbide and the titanium boride is removed by monatomic silicon; and the carbon for reducing the hardness of the base material is converted into hard material silicon carbide which is evenly dispersed, so as to play roles in enhancing the toughness and improving the material hardness. The high-toughness boron carbide composite ceramic can be prepared at low temperature on the premise of not reducing the hardness of a base body.

The invention discloses a battery insulation film with a thickness of 16 to 35 [mu]m, a micropore size of 0.3 to 0.65 [mu]m, and a porosity of 40 to 50 %. The battery insulation film is produced with the following polymer compositions: (a) a mixture of ultrahigh molecular weight polyethylene with a molecular weight of 1.5*10<6> to 7.5*10<6> and high density polyethylene with a density of more than 0.945g / cm<3>, wherein a weight ratio of ultrahigh molecular weight polyethylene to high density polyethylene is 1:1 to 1:20; (b) 500 to 2000 parts of a pore forming agent by weight, when the weight of ultrahigh molecular weight polyethylene and high density polyethylene is regarded as 100 parts; and (c) 0.5 to 20 parts of an anti-oxidant, when the weight of ultrahigh molecular weight polyethylene and high density polyethylene is regarded as 100 parts.

The invention provides a method for uniformly injecting a multi-component thermal fluid in a horizontal well. The method comprises the following steps: (1) segmenting horizontal segments in the horizontal well; (2) initially setting the size of each discharge orifice on a tubular column in each segment of the horizontal well and the number of discharge orifices at a tail end; (3) detecting the temperature, pressure and dryness of the multi-component thermal fluid; (4) obtaining the on-way temperature, pressure, dryness and heat loss of each shaft segment of the horizontal well by iterative calculation; (5) obtaining the actual number of the discharge orifices on the tubular column in each segment of the horizontal well and the size of each discharge orifice by iterative calculation; and (6) drilling the tubular column based on the calculation result, putting the tubular column subject to drilling down into the well, and injecting the multi-component thermal fluid in the tubular column. The invention has the advantages of wide oil pool application range, relatively simple technology and low cost, and ensures that the oil pool at the horizontal well segment can be subject to uniform steam injection without changing the traditional well orifices and steam injection pipes. Besides, by using the invention, the producing degree of the oil reservoir is improved and the optimal exploitation effect can be ensured by injecting the multi-component thermal fluid in the horizontal well of the exploited oil pool.

The invention discloses a completely-integrated impact piece ignitor and a preparation method thereof, which belong to the technical filed of initiators and pyrotechnics. On the basis of a micro electronic mechanical system (MEMS) processing technology, the assembly can be finished in the process of processing a bridge foil, a flying plate, an accelerating chamber and a reflection plate, thus thepreparation method is beneficial to improving the assembly precision of devices. In addition, the completely-integrated impact piece ignitor has the characteristic of parallel processing of an integrated circuit, is convenient to produce in large batch and reduces the manufacturing cost, and is beneficial to improving the consistency and the reliability of the process; and meanwhile, by using themetal bridge foil, the completely-integrated impact piece ignitor has short igniting time and can be widely applied to ignition of a plurality of novel high and safe initiators and pyrotechnics.

The invention discloses a cleaning machine with a supporting and thrusting mechanism, which comprises a rack and a plurality of cleaning tanks, wherein a lifting bracket used for supporting material baskets is arranged in each cleaning tank; at least one side edge of each lifting bracket is connected with a lifting cross beam through a bracket connecting rod; a lifting driving mechanism mounted on the rack can drive the lifting brackets to be lifted to and fro in the vertical direction through the lifting cross beam; horizontal material basket push rods used for horizontally pushing the material baskets to move are further arranged above the cleaning tanks and are driven by a horizontal driving mechanism; fixed brackets are fixedly arranged between adjacent cleaning tanks; upper bearing surfaces of the fixed brackets are positioned in the same bearing plane as bearing surfaces of the lifting brackets lifted to high positions; and the bearing plane is higher than tank openings of the cleaning tanks. The cleaning machine has the advantages of stability and reasonableness in structure and great carrying capacity; and particularly, a cleaning and conveying path of the cleaning machine is reasonable, the effective cleaning time is long and the work efficiency is high.

The invention provides an emergency power-on circuit and method and a car. The emergency power-on circuit comprises a power battery pack, a battery management system, a relay circuit, a first DC / DC convertor, a second DC / DC convertor and an emergency switch circuit. The first DC / DC convertor, the second DC / DC convertor and the battery management system are separately connected to the two poles ofthe power battery pack; the emergency switch circuit is connected with the first DC / DC convertor; the output end of the first DC / DC convertor is connected with the battery management system, and whenthe first DC / DC convertor is turned on, the output voltage of the power battery pack is converted by the first DC / DC convertor into a first low voltage, so that power is supplied to the battery management system, and the battery management system is waked up; the relay circuit is connected between the second DC / DC convertor and the power battery pack in series, and the battery management system isconnected with the relay circuit and the second DC / DC convertor. By means of the emergency power-on circuit, power-on of the car can be achieved under the condition that a storage battery is undervoltage or is damaged, and the use reliability of the car is improved.

The invention discloses a method for controlling low-temperature heating start of an air conditioner as well as the air conditioner and a storage medium. The method for controlling low-temperature heating start of the air conditioner comprises the following steps: responding to a heating start instruction, and obtaining outdoor environment temperature and compressor duration time of stopping operation; according to the outdoor environment temperature and the compressor duration time of stopping operation or according to the outdoor environment temperature and length of a connected tube of theair conditioner, determining that the air conditioner meets a condition of entering a low-temperature heating start control mode; performing at least one of the following: controlling compressor operation, and controlling a four-way valve to electrify while operation time length of the compressor reaches first preset time length; regulating rotation speed of an outdoor fan according to the outdoorenvironment temperature; and obtaining a compressor gas exhaust temperature, and controlling a heating state of an electric heating belt of the compressor according to the gas exhaust temperature andthe outdoor environment temperature. The method can increase gas suction pressure, under a low-temperature environment, of the compressor, and strengthens use reliability of the compressor.

The invention relates to the technical field of fire protection accessory devices, in particular to a spraying device for fire protection tank production. According to the spraying device for the fireprotection tank production, the spraying angle of a spray head can be adjusted, the spraying range of the spray head to a fire protection tank is enlarged, and the using limitation is reduced. In thespraying process of the fire protection tank, it does not need to manually and constantly overturn the fire protection tank to change the spraying position, labor is relieved, operation is easy, an operator is prevented from making contact with paint mist generated in the paint spraying process for a long time, factors of affecting the physical health of the operator are reduced, and the using reliability is improved. The spraying device for fire protection tank production comprises a spraying tank and a base. The inner wall of the right end of a working cavity is provided with a spray head.The spraying device comprises a first swinging rod, a second swinging rod, an adjusting block, two sets of reset springs, two sets of limiting sliding columns, a fixing plate, a driving motor, a transition shaft, a first transmission belt and a second transmission belt and further comprises an upper rotating shaft, an upper ejector plate, a lower rotating shaft, a lower ejector plate, an installation plate, a worm wheel, a worm and a third transmission belt. The bottom end of the installation plate is connected with the rear side of the inner wall of the top end of the spraying tank.

The invention discloses a frequency-division multiplexing (FDM)-based three-dimensional (3D) printer, comprising a frame, a base, an X-axis mobile system, a Z-axis mobile system and a printing device, wherein the printing device is connected with the X-axis mobile system; the X-axis mobile system is connected with the Z-axis mobile system; the Z-axis mobile system is connected with a guide rail of an upright post; a power supply and a controller are arranged on the base; the controller is connected with the Z-axis mobile system; the Z-axis mobile system comprises a third numerical control motor, a left screw and a right screw, a Z-axis fixed base and a limit switch; the left screw and the right screw are respectively arranged at the outer sides of a left upright post and a right upright post; the third numerical control motor is connected with the lower ends of the screws; the screws are connected with screw nuts; the screw nuts are connected with the Z-axis fixed base; the Z-axis fixed base is connected with the X-axis mobile system; a fixed base through hole is formed in the Z-axis fixed base; the left upright post and the right upright post pass through the fixed base through hole; the bearing is matched with the guide rail of the upright post. Thus, the FDM-based 3D printer is simple and compact in structure, small in volume and low in manufacturing cost.

The invention relates to an electric power measurement multifunctional instrument system and a method for measurement. The electric power measurement multifunctional instrument system comprises an electric power measurement module for acquiring and measuring external three-phase voltage and current and transmitting measurement data to a microprocessor module, an LED driving module for driving an LED display screen, the LED display screen for displaying the measurement data output by the microprocessor module, an input module for acquiring input switching value and / or keystroke input value for the microprocessor module, an output module for outputting and performing switching in, switching off, CT overload current warning, and the like to a relay, a storage module for meeting requirements on storing system setting parameters, accumulated electrical degree value and standard check value of the electric power measurement module, and the microprocessor module for performing control operations of initializing the system, responding to timer interruption, reading electric quantity data, storing set data, displaying the electric quantity data, and the like.

The invention provides an AC solid state relay. The AC solid state relay comprises a power circuit, an input circuit, controllable silicon and an alarm output circuit. The AC solid state relay is characterized by further comprising a single-chip microcomputer; the output end of the power circuit is connected with the power input end of the single-chip microcomputer; the output end of the input circuit is connected with the signal input end of the single-chip microcomputer; the alarm output end of the single-chip microcomputer is connected with the input end of the alarm output circuit; the sampling ends of a zero-passage sampling circuit are respectively connected in parallel to two ends of the controllable silicon; the zero passage signal output end is connected with the zero passage signal detecting end of the single-chip microcomputer; the control input end of a controllable silicon triggering circuit is connected with the triggering signal output end of the single-chip microcomputer; the first control output end is connected with the control end of the controllable silicon; the second control output end is connected with an cathode or an anode of the controllable silicon. The AC solid state relay has the advantages that the mode of obtaining the zero passage signal by direct connecting in parallel to the controllable silicon is adopted, thus the fault detection of a load circuit is realized on the premise that the complexity of the circuit is not increased; in addition, the fault of the open circuit in the controllable silicon can also be detected; the control is performed through the single-chip microcomputer, so that the intelligent solid state relay is realized, and the safety and reliability and the product are improved.