41results about How to "Strong performance" patented technology

A mine rescue command visualization of wireless devices includes front-end equipment, repeater equipment, ground receiving equipment. Front-end equipment can capture filed picture under very low illuminance circumstances, and then audio signal and the parameters in the Underground sent to ground receiving equipment by way of repeater equipment, are downloaded and stored by ground operations center platform to achieve the dynamic of the scene underground surveillance and command. The invention's front-end equipment is an independent, full-featured, compact appearance of the micro-devices, adopting the most advanced Mesh wireless broadband network technology, using intelligent explosion-proof AP equipment for data transmission , the invention has real-time, accurate, multi-directional, multi-functional high speed and efficiency the advantages.

The invention relates to a saloon car tyre surface and specially, relates to patterns of the saloon car tyre surface. The saloon car tyre surface comprises a centre pattern block, side pattern blocks and shoulder pattern blocks. The side pattern blocks and the shoulder pattern blocks are orderly and regularly arranged at left and right sides of the centre pattern block from inside to outside. The saloon car tyre surface is divided into left and right symmetrical parts by the centre pattern block. The centre pattern block is a vertical one-piece pattern block and is located in the center of the saloon car tyre surface. The centre pattern block is separated from the side pattern blocks through main vertical circle pattern channels located between the centre pattern block and the side pattern blocks. The side pattern blocks are separated from the shoulder pattern blocks through auxiliary vertical circle pattern channels located between the side pattern blocks and the shoulder pattern blocks. Adjacent two of the side pattern blocks are separated through an inclined side pattern channel and two ends of the inclined side pattern channel are respectively communicated with the main vertical circle pattern channel and the auxiliary vertical circle pattern channel. Adjacent two of the shoulder pattern blocks are separated through a shoulder pattern channel and the shoulder pattern channel is communicated with the auxiliary vertical circle pattern channel. The patterns of the saloon car tyre surface are mixed patterns and thus the saloon car tyre surface can produce an enough braking force and has good control performances and a beautiful appearance.

The disclosed embedded video display device comprises one embedded processor to read in video code flow from a video data resource device, and another DSP decoding processor for decoding and displaying video, wherein it can replace the embedded processor for reading in data from low- to high-end, and replaces DSP processor to realize high code-flow high complex audio/video algorithm. This invention integrates advantages of two processors, and has many choices on processor to support processor combination for different performance request.

The invention discloses a home-made automatic embedded computer system and a display card driving method thereof. The home-made automatic embedded computer system comprises a dragon chip 2F central processing unit and an SM722 display chip, wherein the SM722 display chip is connected with a dragon chip 2F by virtue of a PCI (Peripheral Component Interconnect) bus. The display card driving method comprises the following steps: modifying a firmware layer driver capable of supporting SM712 and an operating system nucleus layer driver, so that the dragon chip carries an SM722 display chip which is originally incapable of supporting an MIPS (Million Instructions Per Second) framework and the PCI bus and thus has higher performance. The home-made automatic embedded computer system has the advantages that the computer human interaction performance and pattern display control performance of products are enhanced and the application field of dragon chip 2F processors is expanded.

The invention discloses an information terminal, which comprises a touch screen module, a real-time operating system and a graphic interface operating system, wherein the touch screen module is used for generating touch information; the real-time operating system is used for reading the touch information which is generated by the touch screen module, converting the touch information into screen coordinate information, and determining that the real-time operating system processes the screen coordinate information or transmitting the screen coordinate information to the graphic interface operating system for processing according to the running state of the graphic interface operating system; and the graphic interface operating system is used for receiving the screen coordinate information of the real-time operating system, converting the screen coordinate information into mouse information, and executing corresponding mouse operation. The invention also discloses a touch control method of the information terminal. The information terminal provided by the invention is characterized by quick start of the real-time operating system and rich functions of the graphic interface operating system, so that the functions of the information terminal are richer, and performance is higher.

The invention discloses a wheeled mobile robot platform. The platform comprises a machine body, supporting racks, wheels and a control system; the platform is characterized in that the machine body is in rigid connection with the supporting racks below the machine body through bolts; the three or more supporting racks are mounted on the lower surface of the machine body uniformly; each supporting rack comprises a supporting rack base, a moving unit and a linear motion unit; the upper end of the supporting rack base is connected with the lower surface of the machine body; the supporting rack base is a hollow column body; both the moving unit and the linear motion unit are positioned in the supporting rack base; axes of the supporting rack base, the moving unit and the linear motion unit are parallel to one another, and perpendicular to the plane of the machine body; the moving unit is a sliding part which is matched with the supporting rack base; the supporting rack base and the moving unit form a moving pair which is driven by the linear motion unit; the lower end of the moving unit is connected with the wheels symmetrically arranged at the lower part of the moving unit; the wheels are motor-driven wheels.

The invention discloses a method of generation of graphic captcha, relates to the technical field of computer applications, and solves the technical problems that in the prior art because of the use of regularity algorithms and simple photo galleries the results are easily learned and cracked by machine. By the method of generation of graphic captcha, multiple character sets are prepared, each character set in multiple character sets is calculated, so that random sizes and colors are provided, by the stochastic processing algorithm through the rotation of the characters and local pixels by a little horizontal or vertical displacement, a variety of superposition combinations of random conditions are produced, especially when the produced background image and the color of the characters are close, no regularities can be found in the texts and the performance against the picture-recognition software is extremely strong, the machine learning resistance performance is significantly enhanced. By the method of generation of graphic captcha, a variety of background images of different sizes are prepared, the size of the resulting produced image is not constant, i.e. the amount of the verification code is uncertain, the problems are solved when the image borders are difficult to define for machine learning and the formation rules cannot be found.

The invention discloses a magnesium battery electrolyte. The magnesium battery electrolyte comprises a non-aqueous solvent and an electrolyte salt dissolved in the non-aqueous solvent. A chemical formula of the electrolyte salt is [Mg2X3Mp][HDMSLiYNq], wherein X is selected from one or more of a minus monovalent halogen ion and a halogen-like ion; Y is selected from one or more of the minus monovalent halogen ion and the halogen-like ion; M and N are the same or different coordination agents; p is selected from any integer from 1 to 6; and q is selected from any integer from 1 to 6. The invention further discloses a preparation method of the magnesium battery electrolyte. The preparation method comprises the following steps: mixing an anhydrous magnesium salt, an anhydrous lithium salt and the non-aqueous solvent to obtain a mixture; and reacting the mixture at 25-200 DEG C, wherein the anhydrous magnesium salt is Mg(HDMS)2, and the anhydrous lithium salt is LiY and/or LiX; and/or, the anhydrous magnesium salt is HDMSMgX, and the anhydrous lithium salt is LiY; and/or, the anhydrous magnesium salt is HDMSMgY, and the anhydrous lithium salt is LiX. The invention also discloses a magnesium battery. The magnesium battery comprises the magnesium battery electrolyte.

The invention relates to a method for recognizing lightning interference by utilizing an average sampling value of a short-window inner polar wave, comprising the steps of: after a protection element starts, solving polar wave voltage according to polar line voltage and polar line current which are obtained through measurement at a relay installed place and according to formulas; directly utilizing the sampling values of the polar wave voltage and the steady-state polar line voltage in a short window; solving a ratio of the polar wave voltage to the polar line voltage which runs in a steady state; and recognizing the lightning interference by utilizing the size of the ratio, wherein the sampling frequency is 10kHz, the time widow is 5ms, the sampling is not influenced by a control system,and the time-delay protection is in a ms level. By utilizing the method, the lightning interference in a full-length range of a line can be accurately recognized. The method has good robustness, verystrong performance of tolerating a transition resistance and stronger practicality and is not influenced by the interference. Proved by vast simulation results, the method provided by the invention has good effect.

The invention relates to a vane of a wind generating set. The length L of the vane is 50.5m, and the radius R of a wind wheel corresponding to the vane is 52m. When the relative radius r/R of the wind wheel is 18.25-99.05%, the aerodynamic shape of a vane section is characterized in that a patched-type airfoil profile with a relative thickness of 55.5-17.5% is used; the chord length of the vane section is 3780-520mm; the torsion angle of opposite chord lines of a vane tip section is 11.75-1.05 degrees; the lift coefficient of a design point is 1.35-1.02; and the design Reynolds number is 1.0*106-8*106. According to the vane of the wind generating set, wind-power utilization coefficients of wind wheels of three vanes exceed 0.45 when the tip speed ratio of each vane with the length L of 50.5m is in the range of 7-11.5, therefore the utilization rate of wind energy is greatly improved, and generating efficiency of a wind power generator is improved.

The invention discloses a sound-accompanied easy-to-learn bodybuilding hula hoop. The hula hoop is structurally composed of a belt, a connecting band, a C-shaped ring hula-hoop body and a sound box, wherein a belt buckle is arranged on the belt, a pulley trolley is arranged in a middle cavity of the C-shaped ring hula-hoop body, a connecting nose is arranged in the middle of the pulley trolley, the connecting nose stretches out of an annular open seam in the middle of the inner circle of the C-shaped ring hula-hoop body and is connected with the belt buckle on the belt through the connecting band, the sound box is provided with an arc-shaped clamping groove, the section of the arc-shaped clamping groove is engaged with the section of the C-shaped ring hula-hoop body, and the sound box is clamped to the outer circle of the C-shaped ring hula-hoop body through the arc-shaped clamping groove. Due to the fact that the C-shaped ring hula-hoop body is connected with the belt through the connecting band and the belt is tied on the waist of a bodybuilder, no matter how the bodybuilder wiggles the waist, the C-shaped ring hula-hoop body and a hula ball cannot get away from the body of the bodybuilder; if the hula hoop is used for exercise and bodybuilding for a long term, the physical power can be strengthened, waist fat can be reduced, lumbar vertebra and cervical vertebra diseases can be prevented, and high popularization value is obtained.

The invention discloses a double operation machine for pulverizing soil and recovering residual film on a hilly land, and belongs to the technical field of agricultural machinery. The operation machine comprises a walking device and a tool rack, a transmission box is arranged on the walking device, and a soil pulverizing cutter shaft, a residual film recovering shaft and a residual film peeling shaft are parallel to one another and are successively installed below the tool rack; the transmission box, the soil pulverizing cutter shaft, the residual film recovering shaft and the residual film peeling shaft are successively connected through a transmission mechanism; soil cutters distributed uniformly are installed on the soil pulverizing cutter shaft; soil pulverizing cutters are fixed to two sides of the soil cutters; residual film recovering cutters distributed uniformly are installed on the residual film recovering shaft; the residual film recovering cutters incline clockwise; residual film peeling teeth distributed uniformly are installed on the residual film peeling shaft; the residual peeling teeth are staggered with the residual film recovering cutters; residual film recovering hoppers are arranged at the back sides below the residual film peeling shaft and the residual film peeling teeth. The operation machine can operate on the hilly hand, soil pulverizing on the hilly land, residual plastic film picking and recovering compound operation can be completed at one time, and the operation machine has the advantages of good operation effect, high operation efficiency, lowoperation cost and the like.

The invention discloses a reinforced fire-resistant high-voltage cable, which includes a cable core. The cable core is formed by twisting three insulated wire cores; ‑1.5mm composite flame-retardant tape, the composite flame-retardant tape is extruded with a PVC inner liner with a thickness of 2.35‑4.75mm, and a soft water pipe with a thickness of 1‑2cm is arranged outside the inner liner, and a thick water pipe is provided outside the soft water pipe It is a metal armor layer of 3-6mm, and the metal armor layer is provided with a PVC outer sheath with a thickness of 2-4mm; the water supply hole and the water outlet hole are provided in the soft water pipe. The invention has the advantages of good flame retardancy, good strengthening performance, good self-supporting performance, good fire resistance, etc., and has the function of automatic cooling.

The invention provides an online updating system for abnormal sound detection. The online updating system comprises an embedded end system and a server end system. The embedded end system collects working audios of a to-be-tested sound source and inputs the working audios to the neural network module for offline abnormal sound classification. And when the offline abnormal sound classification result is that the abnormal sound is not identified, an unknown abnormal reporting module reports the unknown abnormal audio. A server-side system classifies unknown abnormal audios according to equipmenttypes to complete data cleaning and clustering, regulate the network structure of the neural network module and generate a new training set and a verification set, the abnormal sound detection modeltraining is performed on equipment of the model, the training information is issued to the embedded end system without abnormal identification after training is completed to update the abnormal sounddetection system. The present invention further comprises an online updating method for abnormal sound detection. According to the invention, dynamic updating of the abnormal sound detection model isrealized, and the system and the method can adapt to a changing abnormal sound diagnosis working environment.

The invention provides a compounded decoupling agent, which is used for performing reduction treatment on excess sludge in an aerobic sewage treatment process through an activated sludge method. The compounded decoupling agent comprises the components of 3,3,4,5-tetrachlorosalicylamide and zeolite powder in a weight ratio of the 3,3,4,5-tetrachlorosalicylamide to the zeolite powder of 1:(0.1-1.5). The compounded decoupling agent provided by the invention can obviously reduce the attenuation on the activity of sludge while keeping good sludge reduction performance, and has a very obvious positive effect and stronger performance embodied in the sludge reduction; by adopting the compounded decoupling agent, the added TCS can be reduced by 20 to 60 percent to achieve the same sludge reduction rate; and when the TCS is added into a system, the COD removal rate is basically not affected.

The invention provides a medium and small-diameter iron-plastic combined super wear-resisting and high-strength floating oil seal ring. The oil seal ring comprises a plastic ring body. An iron sheet ring is mounted on the plastic ring body. A wear-resisting material is sprayed to the surface of a first supporting part and the surface of a second supporting part of the iron sheet ring to form a first bright band ring surface and a second bright band ring surface. The first bright band ring surface and the second bright band ring surface of the iron sheet ring are ground and polished. A plasticring mold is manufactured according to the manufactured iron sheet ring, modified PPS plastic is poured into a plastic ring mold to conduct injection molding to form the plastic ring body, the contactsurfaces of the iron sheet ring and the plastic ring body are coated with a sealant, and a plug pin of the iron shell ring is inserted into a slot shown in Figure 6 of the plastic ring body, so thatthe iron sheet ring and the plastic ring body are tightly connected to complete manufacturing of the floating oil seal ring. The iron-plastic floating oil seal ring manufactured by applying the new spraying process and selecting the super wear-resisting material is high in quality, high in wear resistance and low in iron-plastic combination material cost and has huge market competitiveness.

The invention provides a water pressure monitoring device. The water pressure monitoring device comprises a fire hydrant, a detector mounted on the fire hydrant and a monitoring center connected with the detector. The detector is connected with the monitoring center through a wireless network. The monitoring center comprises a data processor and a display. The data processor is connected with the display, a keyboard, a printer, an alarm unit, a data storage unit and a data transceiver. The detector comprises a micro-control chip circuit which is connected with a water pressure sensor, a flow sensor, a tilt angle sensor, a tamper-resistant sensor, an identity recognition module, a buzzer, a positioning module, the data transceiver, a power supply and a data interface. The power supply comprises a power supply control circuit. The power supply control circuit is connected with a photovoltaic panel, a storage battery and an external power supply. The water pressure monitoring device can monitor the water pressure, flow and safe states of the fire hydrant in real time and monitor the fire hydrant through the wireless communication technology to achieve the purpose of effective management.

The invention discloses a motor displacement sensor based on an eddy current principle, relates to the technical field of displacement sensors, and provides the following scheme that the motor displacement sensor comprises a probe of the sensor, an extension cable and a front-end device, the probe is connected with the front-end device through the extension cable, the detection end of the probe is close to a detected object, and the probe is connected with the front-end device through the extension cable. A probe coil is arranged at the front end of the probe, the probe is formed by winding an enameled copper wire on a probe framework, the probe framework is made of a polytetrafluoroethylene material due to the requirement of the electromagnetic property of the probe coil, and the probe coil is arranged in a shell made of stainless steel. And an extension cable for connecting the sensor probe and the front-end device is a high-temperature-resistant radio frequency cable. The design of the sensor is mainly based on the eddy current principle, meanwhile, a resonance circuit and a differential circuit are utilized to improve the anti-interference performance, measurement results are further processed through filtering and linear compensation, and most of the prior art cannot meet the complex detection requirements.

The invention discloses an improved waterproof coaxial overhead cable comprising an inner conductor, a water blocking layer, an outer conductor, an insulating layer and an outer sheath. The inner conductor is formed by twisting of a reinforced core arranged at the center and a plurality of single aluminium alloy wires encircling the reinforced core by using the reinforced core as the center. The outer conductor is formed by combination of two pairs of bearing cores that are symmetric by using the cable as the center and a plurality of copper wires. Besides, a flexible water absorption tube is arranged between the insulating layer and the outer sheath. A humidity sensing alarming device is also arranged on the outer sheath, wherein the height of the humidity sensing alarming device is not larger than 1mm and the width is not larger than 2mm. A plurality of sponges are installed in the flexible water absorption tube; a drainage tube is arranged and passes through the inner layer of the outer sheath to be flush with the outer layer of the outer sheath; and a cover cap is arranged at the outlet of the drainage tube. According to the invention, the cable has advantages of excellent reinforced, self-bearing, and waterproof performances, good moisture-resistant and sealing properties, low attenuation, and good shielding effect and a humidity monitoring effect is also realized.

The invention discloses a cooperative energy detection spectrum sensing method based on a Lightgbm algorithm. The method specifically comprises: in a cognitive wireless network, a secondary user detecting energy in a current channel environment and sending a result to a secondary user serving as a fusion center, and a primary user discontinuously sending a label indicating whether spectrum resources are used by the primary user or not to the fusion center; establishing a data set by using an energy detection-based method, wherein the Lightgbm algorithm specifically uses a gradient-based unilateral sampling technology and a unique feature binding technology; dividing the constructed energy feature vector set into a training set and a test set, and performing training and testing respectively; the fusion center distinguishing whether a channel is available or not, and informing all secondary users after a result is obtained. According to the method, under the condition that the false alarm rate 0.1 meeting the IEEE802.11 requirement is used, the detection rate is increased by 6%-7% compared with an SVM, and meanwhile the false classification rate and the false classification risk areremarkably reduced.

The invention discloses an anti-counterfeiting method for a telecommunication user network access living body authentication image. The anti-counterfeiting method comprises the following steps that 1, an acquisition end acquires activation information and a living body image; step 2, inserting anti-counterfeiting data according to the activation information; 3, the verification end verifies the anti-fake data; and 4, outputting an activation result. According to the method, the user identity information and the picture are fused, the anti-fake data are embedded into the pixels of the picture under the condition that picture recognition and display are not affected, meanwhile, calculation is conducted in combination with a matrix collected by a camera, the performance is high, and safety and efficiency are guaranteed.

A manual-automatic integrated high-voltage power distribution cabinet protection pressing plate disclosed by the present invention comprises a shell, a pressing plate assembly and a driving assembly, the two ends of the shell are communicated, and the pressing plate assembly comprises a pressing plate located in the shell, a movable rod located at the upper part of the pressing plate and a first contact electrode located at the upper part of the pressing plate. Second contact electrodes are arranged in the shell, the second contact electrodes are arranged on the two sides of the first contact electrode, and the driving assembly and the movable rod are rotationally arranged. On the basis of a traditional pressing plate, the frequency converter is used in cooperation, and input and cut-out of differential protection in the protection pressing plate can be achieved through a state signal point of the frequency converter.

The invention discloses a dynamic circular situation generation method and terminal, and the method comprises the steps of selecting an environment development tool, and building a network geographic information system; taking the circular situation as a target, and splitting the visual effect of the circular situation; using the environment development tool to control the shape to be circular; using a shader program, and setting different transparencies according to different distances from the circle center; arranging an aperture on the outermost side of the circle, which is used for displaying and emitting light; controlling the circle situation of the whole circle to generate an animation which spreads outwards from the circle center along with time; and controlling the circular edge brightness to reach the highest value to realize a dynamic circular situation. According to the invention, the underlying GPU language is directly used for compiling animations and characteristic effects, the performance is very high, the effect is good, and all work of the dynamic circular situation is completed.

The invention discloses a dynamic community detection model based on representation learning. The dynamic community detection model comprises the following steps: S1, defining a dynamic network; s2, generating a VGRNN model; and S3, combining the VGRNN with a Gaussian mixture model GMM to form a VGRNNCD. According to the invention, a two-step strategy is adopted, namely, low-dimensional embedded representation of a dynamic network is obtained firstly, then clustering analysis is performed by using a clustering algorithm, migration to the dynamic network is performed, a VGRNN algorithm is used,time information is introduced into a GRNN, and the proposed VGRNNCD uses graph self-coding to replace variational graph self-coding in the VGRNN as an improvement; and then clustering analysis is performed by using a Gaussian mixture model (GMM). According to the model, the potential change of the dynamic graph can be better captured by using the high-order hidden random variable, the expressionability of the model is stronger, the fitting ability to data is stronger, and a better effect is achieved when the model is applied to execute a community detection task.

The invention discloses an identity-based digital signature scheme resisting quantum computing. Firstly, in a system initialization stage, a key generator PKG selects a master key which comprises a system scale, a finite field, a hash function and partial public key mapping parameters; secondly, in a private key extraction stage, the signature party A sends a request for obtaining a private key to the PKG, the PKG acts on a hash function on a master key of the PKG, identity information of the user A and a timestamp, and private key data is generated and sent to the PKG; in a signature generation stage, A determines a unique solution by means of data such as private key data, a signed message and a timestamp to obtain a signature. The A sends the signature and the timestamp to a verification party B, and the B can perform verification in a signature verification stage. The identity-based digital signature scheme is constructed by using the multivariate public key cryptography technology, has the advantages of identity data signature and the capability of resisting quantum computing attack, and is related to the PKG master key and key generation time, so that the security is further enhanced.

The invention discloses a rack core of a steel coil hoisting and transferring clamp. The rack comprises a spindle and two laterally connected fixed legs. A center axle rod is fixed to the middle of the spindle, center through slots are formed in the front and back walls of the center axle rod, a center through block is joined to the inner end of each center through slot, outer rubber pads are connected to the left and right ends of each center through block, a fixed center base is welded to the outer wall of each center through block, rotating shafts are mounted at the upper and lower ends ofthe fixed center base, a joining leg seat is placed on the outer side of the rotating shaft, a laterally connected screw hole is formed in the middle of the joining leg seat in a penetrating manner, direct connecting screw holes are formed in the left and right ends of the joining leg seat, threaded pipes are arranged at the bottom end of each laterally connected fixed leg, and the laterally connected fixed leg is located on the outer side of the spindle. The rack core of the steel coil hoisting and transferring clamp is provided with the laterally connected fixed leg, the spindle can be usedconveniently through the three threaded pipes with same included angles, and meanwhile, the performance of the spindle is better by arranging the two laterally connected fixed legs.

The invention provides a coating used on a bearing of a motor rotor, and relates to the technical field of motor processing and production. The coating is characterized by being prepared from the following raw materials in parts by weight: 11 to 17 parts of resin, 6 to 10 parts of nylon 12, 6 to 11 parts of modified active carbon, 1 to 4 parts of zinc stearate, 1 to 3 parts of polyvinyl alcohol, 2to 4 parts of polybutylene terephthalate, 2 to 5 parts of ethyl acrylate, 2 to 6 parts of diethylenetriamine, 4 to 9 parts of vinyl trichlorosilane, 1 to 4 parts of N,N'-ethylenedi(stearamide), 1 to5 parts of methyl acrylate, 8 to 15 parts of anti-foaming agents, 8 to 15 parts of anti-aging agents, 5 to 10 parts of biomass auxiliary material and 20 to 27 parts of deionized water. The coating hasthe advantages that the method is reasonable; the operation is convenient; the wear-resistant and anti-corrosion performance is realized.

The invention relates to an acousto-optic recreational fitness hula ball. The hula ball structurally comprises a belt, a connecting band, a C-type hula loop and a hula ball, a belt buckle is arranged on the belt, an annular buckle is arranged on the inner circle of the C-type hula loop, the belt buckle and the annular buckle on the inner circle of the C-type hula loop are connected through the connecting band, the section of the C-type hula loop is of a C type, a scooter is arranged in a middle cavity of the C-type hula loop and provided with a rope hole, and the rope hole is connected with the hula ball through a connecting rope. As the C-type hula loop and the belt are connected through the connecting band, the belt is tied to the waist of a body builder, the C-type hula loop and the hula ball will not break away from the body of the body builder regardless of the waist twisting mode of the body builder, and in this way, learning confidence of a beginner can be greatly improved.

The invention discloses a construction process of a roof tile roof repaired with grass-root ash, wherein: the construction process steps are as follows: inspecting tiles → dividing the pit and nailing the jue → dividing the middle → laying the bottom tile → nailing the tile mouth → laying the dripping water from the hook head of the cornice → covering the tile → Tile-covered cylinder → Lulu cylinder; the invention has the advantages of heat insulation, moisture-proof, durable, non-toxic, non-radioactive and pollution-free using natural materials. The authenticity of ancient buildings and cultural relics is well protected.