3689 results about "Angle alpha" patented technology

A structurally supported tire includes an outer annular band, and a plurality of web spokes extending transversely across and radially inward from the annular band and anchored in a wheel or hub. The annular band may further comprise a shear layer, at least a first membrane adhered to the radially inward extent of the shear layer, and at least a second membrane adhered to the radially outward extent of the shear layer. A preferred web spoke has a cutaway section transverse to the annular band. The cutaway section has a profile formed by straight line segments joined by a blending radius. The profile of the cutaway comprises a height and a maximum depth greater than five percent of the height and less than thirty percent of the maximum width. The profile has an angle alpha formed by a line tangent to the profile relative to the horizontal at least equal to ten degrees at the radially outermost and radially innermost extent of said profile. The minimum radius of curvature of the profile is at least equal to twenty percent of the height of the cutaway section.

A structurally supported tire includes an outer annular band, and a plurality of web spokes extending transversely across and radially inward from the annular band and anchored in a wheel or hub. The annular band may further comprise a shear layer, at least a first membrane adhered to the radially inward extent of the shear layer, and at least a second membrane adhered to the radially outward extent of the shear layer. A preferred web spoke has a cutaway section transverse to the annular band. The cutaway section has a profile formed by straight line segments joined by a blending radius. The profile of the cutaway comprises a height and a maximum depth greater than five percent of the height and less than thirty percent of the maximum width. The profile has an angle alpha formed by a line tangent to the profile relative to the horizontal at least equal to ten degrees at the radially outermost and radially innermost extent of said profile. The minimum radius of curvature of the profile is at least equal to twenty percent of the height of the cutaway section.

The invention provides a guide for angularly positioning bones in a joint in order to perform arthrodesis, the guide comprising:a base for positioning on the joint, and having an adjustment shaft whose position is designed to be adjusted so as to be substantially vertically above a fixed first geometrical reference point R of the joint; andan adjustment assembly mounted to slide axially and in rotation on the adjustment shaft to adjust respectively a height for the assembly relative to the first geometrical reference point R and a first angle alpha for the assembly about said axis, said adjustment assembly being formed by an angular adjustable member which can be positioned on a graduated piece to adjust a second angle beta centered on the first geometrical reference point R, but situated in a plane different from the first angle alpha.The guide is suitable for metatarso-phalangeal positioning.

An electric pressure cooker with a stirring function comprises a base, a heating plate, a rotary support, a liner and a motor and is characterized in that a rotary support side cylinder is arranged around the rotary support, an external gear ring is fixedly installed on the outer circular surface of the rotary support side cylinder and is meshed with a reduction gear, and the reduction gear is meshed with an output wheel of the motor; the liner is clamped in the rotary support, a long rod is fixedly installed in the middle of the lower side face of a pot cover on an upper opening of the liner, a cross-shaped frame is fixedly installed at the lowermost end of the long rod, each of four fulcrum bars of the cross-shaped frame is sleeved with a sleeve, a heavy square is supported by the sleeves, the long rod is sleeved with a center hole of the heavy square so that the heavy square can rotate around the rod, and a round sink table is arranged on the lower side face of the heavy square; the diameter of a cylinder is D, and D<=2(L+S); an included angle alpha is formed between a lower stirring blade on each of the four sides of the heavy square and the bottom plane of the liner, and alpha is between 15 degrees and 60 degrees; four upper stirring blades are fixedly and symmetrically installed on the portion, above the heavy square, of the long rod, an included angle beta is formed between each upper stirring blade and the bottom plane of the liner, and beta is between -60 degrees and -15 degrees.

The invention relates to a dome-like dedusting coke quenching tower, which comprises the following parts: a coke quenching procedure at the bottom and a deduesting procedure at the top, wherein the coke quenching procedure is equipped with a coke quenching injecting pipe; the dedusting procedure is divided into three lattices; the bottom of two side lattices sealed by a tipping plate; the bottom of the tipping plate is equipped with blow-off hole; the included angle alpha of the tipping plate and the horizontal surface is 10-75 degree; the top of the coke quenching injecting pipe and the middle lattice entrance of the dedusting procedure are equipped with a plurality of washing and cooling devices; the top of washing and cooling devices and the top of the coke quenching tower are equipped with dome-like dedusting device which covers the middle lattice and two side lattices of the coke quenching tower dedusting procedure. The invention reduces the dust content after washing the polluting vapor with the water fog, cooling the polluting vapor, settling the polluting vapor gravitively and changing the direction of the gas flowing, which reduces the water consumption.

The invention discloses an internally-arranged blind window with double layers of hollow glass, and belongs to the technical field of sunshade hollow glass products. The internally-arranged blind window comprises a window body, a shutter blind, a blind piece turnover adjusting control mechanism, a shutter blind lifting adjusting control mechanism, a shutter blind lifting and blind piece turnover transition mechanism, a blind piece turnover traction rope upper connecting mechanism, a blind piece turnover traction rope transition mechanism, a bottom strip traction rope transition mechanism and a blind piece turnover traction rope. The shutter blind comprises a bottom strip, a set of blind pieces, a bottom strip traction rope and a blind piece turnover rope. The internally-arranged blind window is characterized in that the blind pieces are of structures with cross section shapes tendency to S shapes, and the blind pieces are composed of large semicircular blind piece bodies and small semicircular blind piece bodies; arch directions of the small semicircular blind piece bodies is opposite to the arch directions of the large semicircular blind piece bodies, and the positions, located on the blind pieces, of traction rope recess holes are located on edge portions of sides, away from the small semicircular blind piece bodies, of the large semicircular blind piece bodies; the width of a closed gap between adjacent blind pieces and the degree of a maximum visual included angle alpha are obviously reduced, and a user is prevented from peeping at the interior from the exterior; and the privacy is protected, and safety is ensured.

The invention discloses a bias output three freedom spherical parallel mechanism with a central spherical hinge, which consists of a three freedom spherical parallel mechanism, the central spherical hinge and a bias output link unit, and is characterized in that the lower end of a lower support bar (3) of the central spherical hinge is fixed to a fixed platform (1); the axis of the lower support bar (3) passes through the central point of the fixed platform (1); a cylindrical straight output link (8) passes through the center of a moving platform (7), is fixed to the moving platform or connected with the moving platform through a prismatic pair; the upper end of the straight output link (8) is fixedly connected with a bias output link (9) at the point of intersection (A) of central lines; the axial included angle alpha h of the cylindrical straight output link (8) and the bias output link (9) ranges from 0 DEG to100 DEG; and the bias direction is random. The bias output three freedom spherical parallel mechanism has the advantages of high restriction, high rigidity, large working space, unloading function and greatly improved mechanical property of mechanism.

The invention relates to a tail angle restraining guidance method based on sliding mode control, and belongs to the technical field of guidance. Firstly, a novel aircraft kinematics and dynamics model is built, then tail time is guided, distance between aircraft position coordinates and target position coordinates (xf, yf) is minimum, an expected tail end trajectory dip angle gamma f is a designed target, according to a back stepping method, a virtual control volume is designed to enable a sliding mode function and a differential coefficient to be simultaneously up to 0 in the tail time of flying, and according to Lyapunov method, trajectory dip angle change rate gamma' of an auxiliary control volume is obtained in a solving mode. The trajectory dip angle change rate is converted into an attack angle alpha, an aircraft novel model which is initially built is inputted, a track of the aircraft is adjusted in a real-time mode so as to meet an expected terminal condition, and therefore tail guidance is achieved. The method considers effect of aerodynamic characteristics of the aircraft on a guidance process, is more close to an actual condition, needs little information volume, and is wide in obtained trajectory dip angle tail value range, and smooth in obtained control volume change, and an attitude control system is easy to track.

The invention discloses a device and a method for adjusting the view field of a spliced panoramic camera. The adjusting device comprises an inclined plane, a guide rod and an adjusting lever, wherein a camera is arranged on the inclined plane; the adjusting lever consists of an upper connecting rod and a lower connecting rod; the guide rod is provided with a sleeve sliding linearly along the guide rod; the inclined plane is hinged with the sleeve through the upper connecting rod which is hinged with the upper edge of the inclined plane; the inner side of the inclined plane is vertically fixed with the lower connecting rod which is coaxial with the optical axis of the camera; and the inclined plane is hinged with the lower end of the guide rod through the lower connecting rod. The adjusting method comprises the following steps of: calculating a required inclination angle alpha 1 and a current inclination angle alpha 0 of the optical axis of the camera according to the view field adjusting range of the camera; synchronously adjusting the inclination angle of each camera optical axis of the spliced panoramic camera to the alpha 1; and regenerating a spliced panoramic image according to the adjusted inclination angle alpha 1 of the camera optical axis to complete view field adjustment. The device and the method are simple and effective and meet the objective requirement on the adjustment of the view field of the camera in practical application of the spliced panoramic camera.

An arithmetic processing method and system in a wide velocity range flight velocity vector measurement system using a square truncated pyramid-shape five-hole Pitot probe. Approximation equations that determine attack angle alpha and sideslip angle beta in the form of third-order equations concerning attack angle pressure coefficient Calpha and sideslip angle pressure coefficient Cbeta, which are known numbers, are expressed in the form of a polynomial equation concerning Mach number M, where the coefficients are obtained from a lookup table. Coefficient calculations in the polynomial equation, and attack angle a and sideslip angle beta, calculations may be performed as simple calculations by specifying and applying known numbers into the approximation equation without solving third-order equations, with calibration coefficients that form the basis of coefficient calculation with the polynomial equation first being stored in memory in advance as a table for each wide velocity range on the basis of wind tunnel testing. A Mach number may be calculated instantly from a lookup table by specifying Mach pressure coefficient CM and angle to airflow pressure coefficient Cgamma. Wide velocity range flight velocity vector measurement with a high update rate which is capable of real time response in flight control as demanded by aircraft is obtained.

The invention discloses a reentry vehicle full-order non-singular terminal sliding mode posture control method, relates to a reentry vehicle full-order non-singular terminal sliding mode posture control method based on a robust differentiator, and belongs to the technical field of vehicle control. The method includes the steps: generating the state vector of a vehicle; building a mathematical model of a reentry vehicle; simplifying the model of the reentry vehicle by feedback linearization; giving command information yc=(alpha c, beta c and mu c) T of a progressive tracking system for posture angles alpha, beta and mu of the vehicle when external interference exists in the system and parameters are uncertain; controlling allocation to obtain a rudder reflection angle command delta=(delta e, delta a and delta r) T; inputting the obtained rudder reflection angle command to the vehicle and controlling the posture of the vehicle. Tracking errors can be converged into zero within limited time, singular problems of controller output can be avoided, measuring noise generated by a traditional differentiator is suppressed by estimating error second-order derivatives, and buffeting of control quantity is eliminated by boundary layer and low-pass filtering techniques.

The invention provides a celestial autonomous navigation method based on star sensors, which comprises the following steps: calculating attitude information based on a geocentric inertial coordinate system, which is output by a star sensor; calculating the optical axis direction based on the geocentric inertial coordinate system; converting the optical axis direction based on the geocentric inertial coordinate system into optical axis direction based on a WGS84 coordinate system; reading the included angles alpha 0 and beta 0 between the X and Y directions of the star sensor and the horizontal direction from a laser level meter; calculating the direction in the WGS84 coordinate system when the optical axis direction is perpendicular to the horizontal level; calculating the longitude alpha and latitude beta of the underground point S of the carrier; and outputting the attitude q and the longitude alpha and latitude beta of the underground point of the carrier in the geocentric inertial coordinate system. The invention avoids measurement and control errors caused by horizontal reference platforms, enhances the measuring accuracy, and simultaneously outputs the attitude of three axes and the longitude and latitude of the carrier in the geographic coordinate system in real time, thereby completely realizing celestial autonomous navigation.

A method is provided for forming a halo implant in a substrate adjacent one side of a structure, the method including forming the structure above a surface of the substrate, the structure having first and second edges and forming a mask defining a region adjacent the structure, the mask having a thickness τ above the surface and having an edge disposed a distance delta from the first edge of the structure. The method also includes implanting the halo implant at an angle alpha with respect to a direction perpendicular to the surface, wherein the tangent of the angle alpha is at least the ratio of the distance delta to the thickness τ.

The invention relates to a suction fan impeller of a mower, which is characterized in that blades are arranged on a wheel disc. In the wheel disc, the periphery of a hub is provided with a blade disc, 2-4 blades are uniformly distributed on the blade disc, the inner ends of the blades are in overlap joint with the outer end of the hub, and the included angle Alpha between the center lines of the blades and the diameter which is tangential to the inner ends is 30-80 degrees; in the blades, the front side surfaces of the blades are shaped as a parallelogram, the included angle Beta between the inner side edge and the bottom edge of the parallelogram is 50-80 degrees; the back side surfaces of the blades are shaped as a trapezoid, the outer side edge of the trapezoid is perpendicular to the bottom edge, the plane in which the upper bottom edge of the trapezoid and the upper bottom edge of the parallelogram are located is parallel to the plane in which the lower bottom edge of the trapezoid and the lower bottom edge of the parallelogram are located; the included angles Gamma between the front side surfaces and the back side surfaces of the blades are 20-45 degrees; the inner ends of the blades are an integrated circular arc surface with radius of 15-30 millimeters which is tangential to the front outer side surfaces and the back outer side surfaces; and the outer ends of the front side surfaces of the blades are coupled with the inner surfaces of the back side surfaces.

The disclosure relates to methods and devices for adjusting and setting the alignment of the radio axis of a radar installed on a vehicle with respect to a determined direction. The method, in making use of an adjustment and setting stand comprising a goniometer-responder, consists: in acquiring the angles alpha and beta, alpha a being the azimuthal angle at which the radar perceives the goniometer-responder and beta being the angle between the determined direction and the axis of the stand; determining the azimuth gamma of the radar by means of the goniometer-responder when the radar, configured in test mode, sends out a continuous frequency; equalizing the azimuth gamma with the angle beta by translating the goniometer-responder along its axis of motion; nullifying the angle of azimuth alpha by actuating the means to adjust the radar in azimuth. The device includes a goniometer-responder used to locate the radar in azimuth and in elevation when the radar is in test mode and sends out a continuous frequency. Application: especially to the adjustment and setting of the alignment of the radio axis of a radar installed on a vehicle with respect to the thrust axis of the vehicle.

The invention discloses a multi-axis curved surface type numerically-controlled method for machining a complicated curved surface part. According to the method disclosed by the invention, the axis of a cutter can be arranged according to the directions of longitude and latitude normal lines for forming a curved surface, an inclined angle is adjusted to generate a cutter path, and the machining efficiency and the part surface smoothness can be improved. The numerically-controlled method can be realized by the following technical scheme: a part is fixed in a rotary center of a five-shaft machine tool; a curved surface is reconstructed according to the curvature change, the normal line direction of the curved surface and a machining path; a space change of an axis vector of the cutter is controlled by adjusting the front inclined angle and the side inclined angle of a cutter shaft of a flat-bottom end mill so that the cutter always keeps that a cutter tip participates in curved surface cutting in the five-axis continuous cutting process; a curved surface projection machining manner is adopted in the programming process so that the mill can carry out multi-axis linked milling machining according to the curvature change of the curved surface; the axis of the cutter is similar with a relatively small front inclined angle alpha overlapped to the normal line direction of the cutter path and a side inclined angle is set as 0; the axis of the cutter is kept vertical to the direction of the machining path to implement a five-axis linked machining numerical control procedure.

The invention provides a cold-bending molding technology and a production line for producing a broad width U-shaped channel steel. The technology comprises the following steps: 1) sheets are pinched synchronously; 2) the sheets pass through a plurality of roll loading devices, the roll loading devices bend both sides of the sheet so as to make both sides of the sheet produce a bending angle alpha, and in the moving direction of the sheet, the rear roll loading device makes the bending angle alpha increased gradually to 90 degrees, so a U-shaped channel steel is initially molded; and 3) the side surface of the U-shaped channel steel initially molded is rectified. With the technology, the flat sheet can be relatively and continuously molded into the integral U-shaped broad width channel steel without welding. The production line of the technology has the advantages of no limit on the total length of the channel steel, high production efficiency, stable production quality, stable operation, low noise and the like.

Disclosed is an automatic shooting parameter adjusting system of a three dimensional (3D) camera device. Hardware of the system comprises a 3D panorama three-dimensional photographic device, the 3D camera device and a computer, the system is composed of four integrated omnibearing photographic devices with the same imaging parameters, the 3D panorama three-dimensional photographic device provides information of various shooting parameters such as a shooting angle alpha R, an azimuth angle phi R, a horizontal opening angle theta, a focal length f1 and an aperture value F for the 3D three-dimensional camera device, and movements of an electrical motor such as horizontal rotating, vertical rotating, focusing and adjusting of the horizontal opening angle and the 3D depth of the 3D three-dimensional photographic device are controlled automatically based on parameter values and a PELCO-D control protocol, so that a three-dimensional projection device can display an overall 3D panorama video image and a 3D video image and can be used for browsing local close-up, a high-quality 3D panorama and a 3D video image can be shot without aid of three-dimensional photographic professionals, and the system can be widely applied to various application fields such as great sports event, artistic performance, animation and films and games.

The invention discloses a free-form surface micro-milling cutting force modeling method. The free-form surface micro-milling cutting force modeling method comprises the following steps of (1) obtaining machining parameters including the radius R of a cutter, a helix angle beta of the cutter, the number Nf of cutting edges, the feed amount ft of each tooth, an eccentric distance p of the cutter and the initial eccentric angle alpha of the cutter, (2) dispersing the cutting edges of the cutter in the axial direction to form a series of cutting micro-elements and obtaining cutting micro-elements involved with cutting, (3) calculating the instantaneous cutting thickness of the cutting micro-element P (k, phi) with an axial angle phi of the current cutting edge, (4) calculating the cutting force of the micro-element P (k, phi) and (5) calculating the sum of the parameters obtained in the steps (3) and (4) and the cutting forces of the micro-elements involved with cutting to obtain the cutting force of the cutter. By means of the free-form surface micro-milling cutting force modeling method, the micro-milling cutting force of a free-form surface can be efficiently and accurately predicted.

A developing unit includes a developing hopper, a toner reserve container that incorporates a replenishing roller and a replenishing port forming a toner replenishing portion, arranged adjacent to the developing hopper in order to supply the toner to the developing hopper. The toner reserve container further includes an agitator rotatable about a rotary shaft and a conveying sheet attached to the agitator for conveying the toner to the replenishing roller. The conveying sheet has a bent portion where the conveying sheet is bent in the rotational direction of the agitator at a halfway point thereof with a predetermined angle alpha. Deformation of the conveying sheet during rotation is absorbed around the position of the bent portion, so that the conveying sheet will not be plastically deformed at the attached part of the conveying sheet joined to the attachment edge of the agitator, whereby long stable toner conveyance by the conveying sheet can be maintained.

The present invention discloses a flexible robot vision recognition and positioning system based on the depth learning. The system is implemented in the following steps: obtaining an image of a part, carrying out binarization processing on the image of the part to extract an outer contour of the image of the part; finding out a circumscribed rectangle of the outer contour edge in the lateral direction, determining to-be-recognized areas, and normalizing the areas to a standard image; gradually rotating the standard image at an equal angle, finding out a rotation angle alpha when the standard image is rotated to a minimum area of the circumscribed rectangle of the outer contour edge in the lateral direction; using a depth learning network to extract the outer contour edge when the rotation angle is alpha, and recognizing the part and the pose of the part; and according to the rotation angle alpha and the pose, calculating the actual pose of the to-be-recognized part before rotating, and transmitting the pose data to a flexible robot, so that the flexible robot can pick up the to-be-recognized part. According to the system disclosed by the present invention, contour shape features contained in the part image data are automatically extracted layer by layer by using the depth learning network, so that accuracy and adaptability of part recognition and positioning can be greatly improved under the complicated conditions.

Golf clubhead (1) made from metal, having a strike face (2) which has a loft angle alpha of greater than 45°°, said strike (2) face having has a plurality of parallel grooves (10), characterized in that the strike face (2) has a surface roughness Ra of less than 0.25 micrometre, and in that the Vickers hardness of the strike face (2) is greater than 5 GigaPascal.

The invention discloses an independent front suspension with a transversely arranged steel plate spring. The independent front suspension with the transversely arranged steel plate spring comprises a left front shock absorber and a right front shock absorber both provided with a limiting block, left and right steering knuckles, a steel plate spring, and a steady rod component, wherein left and right lower swing arms are respectively connected with the left and right steering knuckles through lower swing arm ball pins; the transversely arranged steel plate spring is composed of two transversely arranged upper and lower steel plate springs with variable cross-sections; the middle part of the steel plate spring is connected with a car body; the central line of the steel plate spring is consistent with an X-direction of a wheel center of a wheel; two ends of the steel plate spring are connected with the left and right lower swing arms through a vulcanized rubber component; the shock absorbers are arranged vertically in a front view of a car, inclined backwards in a side view thereof and have an included angle alpha of 2-4 degrees with the axial line. The independent front suspension, disclosed by the invention, has the advantages of compact arrangement, rational structure, relatively low manufacturing and processing cost; the transversely arranged steel plate spring is mutually matched with a single-angle shock absorber, so that the car can achieve relatively ideal comfort level in any load state, good operational stability of a McPherson suspension is continued, and internal space of the car is further maximized; and obvious improvements in the aspects of overall performances, cost and the like are achieved.

The invention discloses a line segment vacuating device for an electronic map and a method thereof. The device comprises a map lead-in module, a threshold value setting module, a vertical distance calculating module, an included angle calculating module and a line segment vacuating module. A straight line enabling a head point PS of a curve to be connected with a tail point PE of the curve serves as a datum line, the maximum vertical distance dm from other end points on the curve to the straight line PS-PE is calculated, the point with the maximum vertical distance is recorded as Pm, an included angle alpha formed by the vector PS-Pm and the vector Pm-PE is calculated out, compared the dm with the D, the a and the A, if dm<=D and a <=A, then only the head point PS and the tail point PE of the curve are retained, all other points are removed; if dm> D and a>A, then the Pm point separates the curve into two portions, vertical distance calculating, included angle calculating and line segment vacuating are repeatedly carried out on the two portions, until the dm>=D and a>=A. The line segment vacuating device can not only guarantee vacuating vigor and certain compression ratio, but also give consideration to vacuating deformation and guarantee smoothness of line segment after vacuating, and cannot enable original line forms to be excessively distorted.

A tread (1) for a tire with a preferred rolling direction, the tread having grooves (2) of substantially circumferential orientation which delimit ribs (30, 31, 32, 33, 35), at least one of which is provided close to each of its traverse edges with a plurality of incisions of width smaller than 1.5 mm. The incisions open onto the contact surface of the tread, are essentially parallel to one another, and having a mean inclination alpha different from zero relative to the direction perpendicular to the rolling surface (S) of the tread. The tread is characterized in that, when viewed in a section plane perpendicular to the rotational axis of the tire, each incision in a given rib, relative to a perpendicular to the contact surface of the rib at the point where the incision intersects the surface, has an inclination which varies through the thickness of the tread, each incision being inclined at an angle beta1 relative to said perpendicular at its point of intersection with the rolling surface when new, the angle beta1 being larger than the angle alpha, and at an angle beta2 at the point of the incision furthest inside the tread, the angle beta2 being smaller than the angle alpha. The point of the incision furthest inside the tread being located, relative to said perpendicular, such that it is ahead of the point of the incision located on the contact surface of the rib.

The invention provides a method and an apparatus for scribing a brittle material substrate where a scribing trench can be effectively created both in the resin layer and the brittle material plate from the same side. A cut trench 22 is created in a resin layer 21 from the top by means of a fixed blade 1 or a laser beam, and then the brittle material plate is scribed along the above described cut trench 22 with a cutter wheel 2 having inclining surfaces with two angles on the two sides of the blade, and thus, a scribing trench 23 is created in the brittle material plate. The above described cutter wheel 2 is provided with a blade 2a for scribing a brittle material having a large angle +- between the ridge lines in the edge portion and second inclining surfaces 2c which continue from the first inclining surfaces 2b on the left and right of the blade 2a for scribing a brittle material so that the angle Beta at which the virtual lines along the left and right second inclining surfaces cross is smaller than the angle alpha between the ridge lines in the above described edge portion, and thus, the two sides of the blade have inclining surfaces with two angles in the structure.

The invention provides a method for washing an aluminum alloy oxidation film to be welded via laser, relates to an efficient, high-quality, environmentally-friendly and stable washing process and solves the problems such as multiple processes, low efficiency, surface scratch damage, low stability and environmental pollution and the like of the chemical and mechanical washing methods at present. The method comprises the following steps: a position setting step, wherein a laser galvanometer head is capable of emitting a laser beam with nanoscale short pulse, an included angle alpha is formed between an optical axis of the laser beam and a surface to be washed at an intersection point, and alpha is greater than or equal to 30 degrees and less than or equal to 60 degrees; enabling a compressed air nozzle to point at the intersection point, forming an included angle beta between the compressed air nozzle and the surface to be washed, wherein beta is greater than or equal to 10 degrees and less than or equal to 20 degrees; enabling a suction nozzle of a dust sucking system to point at the intersection point, and forming an included angle gamma between the suction nozzle and the surface to be washed; a power setting step of setting average power and washing rate of the laser beam according to the thickness of an oxidization film with the surface to be washed; and a washing step of washing the surface to be washed via laser at the average power and the washing rate.

An absorbent article, such as a sanitary napkin, a panty pad or a guard for persons afflicted with light incontinence, intended to be worn in the crotch part of underwear and having a generally elongated shape which includes two long sides (5, 6), two short sides (7, 8), two end parts (10, 11), a central part (9) between the end parts, a liquid-permeable sheet (2) intended to face towards the wearer's body, a liquid-impermeable sheet (3) intended to face away from the wearer's body, and an absorbent layer (4) located between these sheets, wherein the article further includes a main body (1) and at least two fastener flaps (12, 13) located on the liquid-impermeable sheet of the article, wherein the flaps are arranged to take a first use position A in which they form an angle alpha to the liquid-impermeable sheet (3), wherein in addition to the first use position A the flaps (12, 13) are also arranged to take a second use position B in which they lie against the liquid-impermeable sheet (3), and wherein the flaps (12, 13) are able to swing between their first use position A and their second use position B.

The invention discloses a laser three-point dynamic positioning method and a system thereof. The method comprises: two base stations which are a first base station and a second base station are arranged at the fixed positions; a main station is arranged on a moving object; the base stations transmit the laser to the main station; the base stations are connected with the main station by wireless communication; a base line is defined to be a connecting line between the first station and the second station; the first base station acquires the included angle alpha between the main station corresponding to the first base station and the base line, and the included angle beta between the main station corresponding to the second base station and the base line; the first and the second base stations respectively send the included angles alpha and beta to the main station; and the main station can determine the position of the main station according to the included angles alpha and beta as wellas the length L of the base line. The laser three-point dynamic positioning system is constructed according to the method. The technology can be used for locating the moving object in field operationin the environment without marks in a dynamic, and has the advantages of high locating accuracy, simple operation principle and low implementation cost.