352results about How to "Guaranteed width" patented technology

The present invention discloses a dynamic scale distribution-based retinal vessel extraction method and system. The method includes the following steps of: retinal image preprocessing: contrast enhancement is performed on the green channel component of a color retinal image; image segmentation: the preprocessed retinal image is segmented into a set number of sub-images; vessel classification: the vessels of each sub-image are divided into three categories, namely, a large category, a medium category and a small category; dynamic scale allocation: filters of different scales are dynamically selected to enhance vessels of different widths; multi-scale matched filtering; threshold processing: vascular structures are extracted, nonvascular structure was removed, the extraction results of all the sub-images are re-spliced, so that a retinal vessel network binary image can be obtained; and post-processing: post-processing is carried out, so that a high-segmentation accuracy retinal vessel network image can be obtained. With the method and system of the invention adopted, the vessel extraction of the retinal image can be realized; excessive estimation of the widths of the vessels can be avoided when complex nonvascular structures are removed; and simpler and more accurate retinal vessel extraction can be realized.

The invention discloses a glaze and preparation of an embossment phantom glazed brick. The glaze comprises a ground glaze, a surface glaze and an embossment phantom printing glaze, wherein the ground glaze is prepared from a frit b, zirconium silicate, kaolin, calcined kaolin, potassium feldspar powder, fired talc, aluminum oxide powder, quartz powder, carboxymethyl cellulose, sodium tripolyphosphate and water; the surface glaze is prepared from a frit, the frit b, a frit c, kaolin, carboxymethyl cellulose, sodium tripolyphosphate and water; the embossment phantom printing glaze is prepared from parent glaze powder, zinc oxide, tin oxide, cerium oxide and ceramic adhesive roll-printing oil; the parent glaze powder is prepared from the frit c, kaolin, carboxymethyl cellulose, sodium tripolyphosphate and water. The preparation method comprises the following steps: sequentially applying the ground glaze and the surface glaze on a green brick, then printing the embossment phantom printing glaze, performing inkjet printing, and finally firing to obtain the embossment phantom glazed brick. The product disclosed by the invention has unique decorative effect and visual aesthetic feeling; moreover, each indicator can reach the standard requirements, so that the product has relatively strong universality, and is easily popularized in the industry.

The invention relates to a method for manufacturing a 6-inch power metal oxide semiconductor (POWERMOS) transistor epitaxial layer. The method is characterized by comprising the following steps of: 1) selecting a suitable POWERMOS transistor substrate slice and performing a certain preprocessing; 2) performing HCl gas-phase corrosion on the substrate slice at a certain temperature; 3) performing primary H2 speed-variable sweeping; 4) depositing an undoped intrinsic layer with the thickness of 1 to 2 mu m on the substrate slice; 5) performing secondary H2 speed-variable sweeping; and 6) forming a second epitaxial layer on the intrinsic layer. By the method, an autodoping phenomenon is inhibited to the maximum at a high temperature and substrate impurities are effectively prevented from diffusing and doping to the epitaxial layer, so that the resistivity uniformity and the width of a transition area are ensured; therefore, the requirements on both the breakdown voltage (BVDSS) and the on-resistance (RDSON) of the device are met.

The invention provides a binary offset carrier modulation signal side peak eliminating and main peak capturing method. The method includes the steps that (1) 1ms medium-frequency signals serve as received data, a Doppler frequency shift range is selected, stepped frequency is searched, and meanwhile a detection threshold value is set; (2) frequency mixing is carried out on the received data and local copy carriers, and signals with the carriers removed are obtained and undergo FFT processing; (3) 12 sub signals are generated locally due to decomposition of a BOC modulation signal, FFT is carried out, a conjugation is obtained, the received data are respectively multiplied by the conjugation, IFFT is carried out, and the results are stored; (4) needed 12 sub-formulas of an auxiliary formula are stored locally; (5) the position, where a self-correlation main peak of the signal is located, is determined, and the results of the step (3) and the results of the step (4) are correspondingly added; (6) correlated functions are transformed and reconstructed, the results are compared with a preset threshold value, and whether capturing is successful is judged. A side peak of the BOC (15, 2.5) modulation signal can be completely eliminated, and accordingly a receiver can well capture the main peak of the signal.

The invention relates to the field of LED (Light-Emitting Diode) packaging, in particular to an LED display screen. The LED display screen comprises a lamp panel and LED lamp beads arranged on the lamp panel, wherein light absorption face masks are arranged on the lamp panel and are positioned among the LED lamp beads; the widths of the light absorption face masks are gradually reduced from the ends in contact with the lamp panel to the opposite ends. The light absorption face masks are arranged among the LED lamp beads for absorbing external light, so that external stray light is reduced, and the display contrast ratio is promoted; meanwhile, the structures of the light absorption face masks are improved, so that the widths, at the ends in contact with the lamp panel, of the light absorption face masks are greater than those at the other ends opposite to the ends in contact with the lamp panel, the widths, at the ends far away from the lamp panel, of the light absorption face masks are arranged in a reduced mode, the absorption and blocking of light absorption walls of the light absorption face masks for red, green and blue light rays in the LED lamp beads are reduced, the visual angle of the display screen is enlarged, and the visual color difference is eliminated as much as possible. Meanwhile, the using material of the light absorption face masks is further reduced, and the product cost is reduced.

A stator arrangement of an electric machine, generator, and wind turbine includes a plurality of stator segments forming substantially the stator of the electric machine in a cylindric form around a radially centered shaft. The stator arrangement is radially surrounded by a rotatably mounted rotor arrangement. The stator segments are radially mounted on an outer surface of a support structure. The support structure is fixed via rigid connections to the shaft.

A stator arrangement of an electric machine, generator, and wind turbine includes a plurality of stator segments forming substantially the stator of the electric machine in a cylindric form around a radially centered shaft. The stator arrangement is radially surrounded by a rotatably mounted rotor arrangement. The stator segments are radially mounted on an outer surface of a support structure. The support structure is fixed via rigid connections to the shaft.

The invention discloses an asymmetric involute worm and bevel gear pair. The asymmetric involute worm and bevel gear pair comprises a worm and a bevel gear, the two sides of gear teeth of the worm are provided with a worm mesh side tooth profile and a worm non-mesh side tooth profile respectively, and the two sides of gear teeth of the bevel gear are provided with a bevel gear mesh side tooth profile and a bevel gear non-mesh side tooth profile respectively, wherein the axial modulus of the worm is m1, the end face modulus of the bevel gear is m2, the pressure angle of the worm mesh side tooth profile is alpha1, the pressure angle of the worm non-mesh side tooth profile is alpha2, the pressure angle of the bevel gear mesh side tooth profile is alpha3, the pressure angle of the bevel gear non-mesh side tooth profile is alpha4, and the following conditions are met: a, alpha1>alpha2, and alpha3>alpha4; b, when m1=m2, alpha1=alpha3, and alpha2=alpha4; when m1 is not equal to m2, m1cosalpha1=m2cosalpha3, and m1cosaplha2= m2cosalpha4. According to the asymmetric involute worm and bevel gear pair, tooth root fracture of the bevel gear can be effectively avoided, and the shock resistance and the bearing capacity of the asymmetric involute worm and bevel gear pair in transmission are improved.

The invention relates to a coffee outlet of Italian coffee machine, wherein said Italian coffee machine comprises a pump for pushing and pressurizing hot water to grind the coffee powder deposited inside the filter (1) of frame (2); the frame (2) is mounted inside the filter holder (3); the filter holder (3) has one or several outlet channels (4) for watering said coffee. And the invention is characterized in that: the middle of base of frame (2) is fixed with a ball valve (5); the ball valve (5) is contacted with the screw compress spring (7), to push the roller (5) and spring (7) into the valve room (11) of valve (5); the valve room (11) is through to the frame (2) via relative upper and lower holes (9, 10), and through to the chamber of filter holder (3); the roller (6) is mounted between the lower part of upper hole (9) and the upper end of spring (7); and the spring (7) is mounted between the roller (6) and the lower hole (10) in downward taper shape while it is molded.

The invention discloses a mountain area river ecological runoff calculating and application method, and solves the problems that mountain area small and medium river annual rainfall distribution is not even, water inflow in a dry season is insufficient, and limited ecological runoff cannot satisfy wide and shallow riverbed full coverage and current continuity; the method comprises the following steps: using a Tennant method to calculate the minimum ecological runoff volume that satisfies the riverbed ecology system basic demands, wherein the minimum ecology flow cannot cover the whole riverbed and form certain depth in a non-flood season; using the minimum ecology flow as the design flow, and using a manning formula to calculate to-be-drilled width and depth of the main channel riverbed; drilling down the riverbed in the main channel of the riverbed according to the calculated width and depth. Engineering measures can narrow and deepen the riverbed, so limited ecological runoff can flow along the riverbed center in the non-flood season, thus preventing riverbed cutoff, ensuring river water body continuity, ensuring riverbed ecology flow, and satisfying mountain area river aquatic biology survival and multiplying basic demands.

The invention discloses a connecting structure of a panoramic sunroof and a vehicle body. The connecting structure comprises a supporting frame and sunroof glass, wherein the supporting frame is formed by a front beam cover plate, a left supporting plate, a rear top cover and a right supporting plate, the front end of the left supporting plate and the front end of the right supporting plate are connected with the front beam cover plate in an overlap mode, and the rear end of the left supporting plate and the rear end of the right supporting plate and the rear top cover are welded in an overlap joint mode; a main positioning hole and an auxiliary positioning hole are formed in the front beam cover plate, a main positioning pin and an auxiliary positioning pin adhere to the sunroof glass, the main positioning pin is matched with the main positioning hole in the front beam cover plate, the auxiliary positioning pin is matched with the auxiliary positioning hole in the front beam cover plate, and the lower surface of the edge of the sunroof glass directly adheres to the supporting frame through gluing. Not only is the matching precision of installation of the panoramic sunroof ensured, but also the sealability and waterproofness of an installation structure of the sunroof glass are improved.

The invention provides a one-way door with plane door leaves and relates to a plate-shaped one-way revolving door capable of being opened in the positive direction and being closed in the reverse direction. The one-way door mainly solves that problem that the gap between the secondary door and the main door of the known plate-shaped one-way door cannot completely block reverse walking of pedestrian and the problems that one end of a folding type secondary door is directly fixed on a connecting rod, a crank connecting rod and a folding door are hinged unstably, the folding secondary door has great inertia during operation, and vibration and noise cannot be overcome. The one-way door comprises three main doors and a secondary door, wherein the three main doors are fixed on a main shaft; the secondary door is connected with the main shaft through a crank connecting rod mechanism; the top of the main shaft is connected with a driving gear of a speed reducer through a key. The one-way door is characterized in that an output shaft of the speed reducer is connected with a pulley through the crank connecting rod mechanism; the pulley is mounted on a rail at the upper end of a door body; the lower part of the pulley is connected with an arc-shaped secondary door edge of the secondary door; the other end of the secondary door is hinged with a secondary door winding drum; a torsional spring is fixed at the end part of the secondary door winding drum; the other end of the torsional spring is fixed on a torsional spring fixing shaft; the upper end of the pulley is connected with a balance belt wheel through a balance belt; the balance belt wheel is fixedly connected to a wheel shaft; one end of the wheel shaft is fixedly connected to the door body through the a balance torsional spring. In the rotating process of the main doors, one main door and the secondary door are contacted all the time and maintain a small gap, so pedestrian only can walk in one way. The one-way door is reasonable and compact in structure, and has a good effect and operates stably through repeated tests.

A spiral plate heat exchanger with multiple spiral channel consists of shell, spiral body, sealing, outlet and inlet . The said spiral body is prepared by applying star central division plate and multiple concentric spiral plates in equal number to branching ends of star central division plate , setting multiple distance columns or distance blocks arranged in interval on one side surface of each spiral plate for forming multiple spiral channels to let heat exchanging fluid flow through .

The invention discloses a method and device for double-sided opposite printing for an engraved intaglio plate, which comprises the steps of: respectively assembling printing plates (more than one) same in quantity on two plate cylinders, wherein the first plate cylinder is provided with a first printing plate and the second plate cylinder is provided with a second printing plate; arranging transfer-printing / impressing cushion layers on a transfer-printing / impressing cylinder, wherein the transfer-printing / impressing cushion layers are in even-number quantity and are one time more than the printing plates on the first or second plate cylinder; and continuously conveying printing stocks to a place between the transfer-printing / impressing cylinder and one of the plate cylinder. Because the first plate roller and the transfer-printing / impressing cylinder are continuously and oppositely pressed in a rotating process, each transfer-printing / impressing plate of the transfer-printing / impressing cylinder is always provided with transferred plate patterns when the transfer-printing / impressing cylinder and the second plate cylinder are oppositely pressed, patterns on the front side and the back side can be simultaneously transferred to the front side and the back side of the printing stocks through once printing, and thus, continuous and ceaseless double-sided printing is realized; and compared with the production efficiency of the printing of the engraved intaglio plate of like type, the production efficiency of the double-sided opposite printing is improved by 100%.

The invention relates to an optimized dispatching method of the photosensitive resistance welding process in multilayer printed circuit board manufacturing, and belongs to the technical field of intelligent optimized dispatching in a manufacturing shop. According to the optimized dispatching method, a dispatching module and an optimization object in the photosensitive resistance welding process are determined, and an optimized dispatching method based on a population increment learning algorithm is used for optimizing the optimization object; the dispatching module is established according to the processing completed time of all circuit boards on all machines, and meanwhile the optimization object is the minimum earliest completed time. According to the optimized dispatching method of the photosensitive resistance welding process in the multilayer printed circuit board manufacturing, expression of a PSR process is made clear and accurate, a probabilistic model can achieve good balance on precision and complexity, the global search of the algorithm achieves more guidance, the historical information of superior individuals can be effectively utilized, and it is also can be guaranteed that the global search of the algorithm has a certain width, the algorithm can better jump out the local optimum, so that the algorithm can search more regions, the local development capacity of the algorithm is improved, and the quality of a solution can be further improved.

The invention provides an exterior wall insulation and decoration system provided with the functions of thermal insulation, decoration and fire prevention and integrally constructed with the structure, and a manufacture and installation method thereof. The insulation and decoration system includes insulation decorating plates serving as exterior formworks, as well as horizontal and vertical caulking strips and fixing pieces, wherein grooves are arranged on the peripheries of the insulation decorating plates; the caulking strips are arranged between the insulation decorating plates and embedded in the grooves; the horizontal caulking strips are provided with horizontal ribs and used for supporting the insulation decorating plates at the upper part during the installation, and installation seams with fixed width are formed between the insulation decorating plates; when the formworks are supported, gaps reserved between the horizontal and the vertical caulking strips are used for mounting wall-penetrating anchor rods; and anchor bolts are embedded in the insulation decorating plates, threads are arranged at the end parts of the anchor rods and used for being connected with the fixing pieces. According to the invention, the fixing pieces are used for connecting the insulation decorating plates with light steel frameworks inside a concrete wall body through the anchor bolts, so that the distance from the light steel frameworks to the inner sides of the insulation decorating plates is kept unchanged, and the thicknesses of protective layers on the two sides of concrete after concreting are accurate.

The invention provides a BOC (15, 2.5) modulation method capturing method based on a combined related function. Firstly, a period of BOC (15, 2.5) intermediate frequency signals lasting for 1 ms are selected as data signals received by a receiver, and a Doppler frequency shift range, a searching stepped frequency and a detection threshold value are selected; secondly, carrier stripping and mixing processing are carried out on the data signals, an I-path signal and a Q-path signal are obtained, and then FFT processing is carried out on the two signals; thirdly, a BOC (15, 2.5) modulation signal generated locally is decomposed into 12 sub-signals, FFT conversion is carried out, a conjugate is taken, and signals on the path I and the path Q are respectively multiplied by the 12 sub-signals, and IFFT conversion is carried out; fourthly, 12 sub-formulas of the needed auxiliary function are stored locally; fifthly, the final result in the third step and the finial result in the fourth step are added correspondingly; sixthly, incoherent integration is carried out on the results of the two paths obtained through processing, and then whether the BOC (15, 2.5) modulation method is captured is judged through comparison with a threshold value gamma. The BOC (15, 2.5) modulation method capturing method based on the combined related function is applied to a BOC (15, 2.5) modulation method of a B3 frequency band in the Compass navigation system.

The invention provides a prefabricated transverse H-shaped underground continuous wall joint section structure. Two side end parts of the cross section of a joint section are provided with semicircular grooves, the middle part of the cross section of the joint section is provided with a circular hole, the joint section is longitudinally divided into a plurality of length sections, a connecting steel plate is arranged at the outer side of the joint of every two length sections, and four sides of the bottom of the joint section are provided with edge feet. The structure has the advantages that: the prefabricated transverse H-shaped underground continuous wall joint section replaces ground connected wall joint equipment and replaces a part of cast-in-place ground connected wall structure, so that the process of pulling the joint equipment is avoided and the construction period and the manufacturing cost are saved; the lower end of the joint section is wedge-shaped and inserted into soil by means of gravity, so that the lower end is effectively fixed, and the width and the quality of the cast-in-place breadth can be effectively ensured; the designed width of the prefabricated continuous wall joint breadth is not less than 1,500 millimeters, and the bypass seepage path of concrete is lengthened; by curved surface design of the contact face of the prefabricated continuous wall joint breadth and the cast-in-place ground connected wall, the seepage problem of the ground connected wall is effectively solved; and the prefabricated continuous wall joint section is made into a member cancelled structure by adopting proper length section by section, so the structure is convenient to transport and hoist.

The invention provides a straw shredding and deep-burying and returning machine for improving a soil plough layer structure. The returning machine comprises a rack, a suspension device, a gearbox, a transmission mechanism, a fertilizer apparatus, a ditching device, a hammer shredding device, a screw conveying device and a stubble cleaning device. The screw conveying device comprises a screw conveying cylinder and a screw conveying roller. After shredded by the hammer shredding device, straw is beaten by a hammer to scatter into the screw conveying roller, and at the same time, fertilizer in the fertilizer apparatus is discharged into the screw conveying cylinder. The fertilizer and the straw are stirred by a left screw auger steel sheet and a right screw auger steel sheet which are located on the screw conveying roller, evenly mixed and jointly discharged into furrows made by the ditching device, so that the straw decomposition is accelerated, humification is conducted, and the soil structure is improved. According to the straw shredding and deep-burying and returning machine for improving the soil plough layer structure, one-time operation can finish the work of ditching, straw shredding, rotary tillage, fertilization, straw deep-burying, earthing and stubble cleaning, so that the labor intensity is reduced, the working efficiency is improved, and the production cost is reduced.

The invention provides a semiconductor structure and a formation method thereof. The semiconductor structure comprises a first opening which penetrates through a first dielectric layer and isolating structures which are arranged between adjacent transistor regions and an insulating material layer; a first thermal conducting layer which fully fills in the first opening, wherein the thermal conductivity of the first thermal conducting layer material is greater than that of the isolating structure material; zeroth conductive plugs which are arranged on the surface of a doped region and penetrate through the first dielectric layer; a zeroth conductive layer which is arranged on the first dielectric layer and electrically connected with the zeroth conductive plugs; a second dielectric layer which is arranged on the first dielectric layer and covers the zeroth conductive layer, wherein an interconnection structure electrically connected with the zeroth conductive layer is formed in the second dielectric layer; carrier wafers which are bonded with the surface of the second dielectric layer and the surface of a top conductive layer; a through hole which penetrates through the insulating material layer and is electrically connected with the interconnection structure; and an underlying conductive plug which fully fills in the through hole. The problem of the self-heating effect of the semiconductor structure can be improved and the electrical performance of the semiconductor structure can be improved.

The invention discloses an ultrafast lens-free coherent electron diffraction imaging method and device. The method is combined with the electronic pulse which is in precise synchronization with process exciting sources (such as femtosecond laser pulses) and a lens-free coherent electron diffraction imaging technology, and comprises the steps of analyzing the strength distribution of the diffracted coherent electronic pulses, and carrying out back calculation to determine the electronic scattering phase, so as to achieve the reconstruction of the structure and the appearance of three-dimensional transient atomic scale. By adopting the method and device disclosed by the invention, the technical problem that the conventional electronic microimaging method has no high time resolution or the existing ultrafast electronic imaging time and space resolution are limited can be solved.

The invention discloses a non-downsampling contourlet transformation-based method for enhancing a remote sensing image road, which mainly solves the problems that the road enhanced by the prior art has large distortion and inaccurate road target detection. The method comprises the realization processes of: firstly carrying out 3 layers of non-downsampling contourlet transformation on a remote sensing image, wherein the numbers of the transformed directions of each layer are 4, 4 and 8 arranged from high to low; setting corresponding structural elements according to the numbers of the transformed directions of each layer; then carrying out directional enhancement on transformed coefficients by using the structural elements in the close direction; calculating the direction of each pixel point in the image to acquire a direction matrix of the image; processing noises and backgrounds in the enhanced coefficients through the direction matrix; and carrying out contourlet inverse transformation on the processed enhanced coefficients to acquire an enhancement result of the image. The method can keep the original width of the road when the road is enhanced so as to ensure that the detection of subsequent roads is more accurate, and can be used for analyzing and processing the remote sensing image road.

The invention provides a robust anti-interference processing method and device of a spread frequency system. The method includes the steps that N sections of intermediate frequency AD sampling signals of which the length is K are accumulated for M receiving array elements of a space frequency two-dimensional processor respectively, and K-point fast Fourier transformation is performed on the intermediate frequency AD sampling signals to obtain a frequency domain array; 102, the number B of frequency points, corresponding a whole bandwidth, of a satellite signal bandwidth is determined; 103, covariance matrixes Rb of the B frequency points in the signal bandwidth are calculated; 104, characteristic decomposition is performed on the covariance matrix Rb of each frequency point, so that the characteristic decomposition expression of each covariance matrix Rb is obtained; 105, according to the characteristic decomposition expression of each covariance matrix, the weight vector of the corresponding frequency point under the constraint of a diagonal loading matrix is determined; 106, the weight vectors wb of all the frequency points are used for performing spatial filtering processing on the frequency domain array; 107, K-point fast Fourier inversion transformation is performed on frequency domain data after spatial filtering, so that time-domain intermediate frequency data are obtained.

A manufacturing method of a nanometer hexagonal sheet-shaped bismuth telluride thermoelectric material orderly comprises: a tellurium bismuth mixing process, an adjusting process, a sealing heating stirring process, and a purification process. The tellurium bismuth mixing process comprises: preparing a mixture of Bi and Te with a mol ratio of 2:3, and dissolving the mixture in an organic solvent to obtain a mixed solution; the adjusting process comprises: adding NaOH and polyvinylpyrrolidone to adjust the shape and size of the product; the sealing heating stirring process comprises: heating and performing heat insulation of the product under a sealing and stirring condition; the purification process comprises: purifying the product by centrifugation, cleaning, and drying. The design of the invention not only prepares the nanometer hexagonal sheet-shaped bismuth telluride thermoelectric material with a controllable product shape, but also is few in process links, short in period, low in energy consumption, and low in cost.

An acoustic surface wave filter comprises a base (2) and a cap (9), a filter pattern layer is arranged on the base (2), and the filter pattern layer comprises a sending interdigital transducer (3), a receiving interdigital transducer (4), ground wires (7), a signal input port (5) and a signal output port (6); the ground wires (7) comprise a first ground wire (71) connected with the sending interdigital transducer (3) and a second ground wire (72) connected with the receiving interdigital transducer (4); the sending interdigital transducer (3) and the receiving interdigital transducer (4) are rectangular interdigital electrodes formed by two comb electrodes which are interdigitated; corners of common terminals of the comb electrodes of the sending interdigital transducer (3) and the receiving interdigital transducer (4) are round corners. In order to effectively avoid a point effect, corner rounding treatment is adopted at joints of the ground wires and the interdigital electrodes, and the point field intensity is effectively reduced, thereby avoiding punch-through and improving reliability of a device.

The invention relates to a dispatching optimization method for the electroless copper plating process of multiple layers of circuit boards and belongs to the technical field of intelligent dispatching optimization in a production workshop. The dispatching optimization method comprises the steps that a dispatching model and an optimization objective of the electroless copper plating process are determined, and the optimization objective is optimized through a dispatching optimization method based on the differential evolution algorithm; the dispatching model is established according to processing finishing time of each circuit board on each process device, and meanwhile the optimization objective is obtained by minimizing the earliest finishing time. By means of the dispatching optimization method, the algorithm can be better guided to conduct global search; historical information of superior individuals can be fully utilized, and it can also be guaranteed that the global search of the algorithm has a certain width; as a result, the search field of the algorithm is wider, the local development capability of the algorithm is remarkably improved, and the solving quality is remarkably improved.

The invention discloses a transparent glass machining method and device, and provides an optical fiber laser device with wavelength of 1020 nanometers to 1090 nanometers. After energy amplification is conducted on laser beams output by the optical fiber laser device through an optical fiber amplifier, optical frequency multiplication is conducted to obtain output green light, the output green light has pulse repetition frequency of larger than 100 KHz, pulse width of smaller than 10 ns and pulse peak power of larger than 15 KW. Energy amplification is conducted on the laser beams output by the optical fiber laser device only through the optical amplifier; the green light is focused on a to-be-machined position of transparent glass, and the transparent glass is machined by moving the focusing position. The transparent glass machining method and device are quite stable in laser output, ensure the glass machining accuracy, can be used for machining various complex patterns and meanwhile increase the machining speed.

The invention discloses a power-on reset circuit, which comprises a voltage source, a capacitor, a Schmidt trigger, a reference current source, a first current mirror circuit and a second current mirror circuit, wherein one end of the capacitor is connected with the input end of the Schmidt trigger, and the other end of the capacitor is grounded; the reference current source is connected with the voltage source; the first current mirror circuit is used for duplicating the reference current of the reference current source into first current in proportional relation way; the second current mirror circuit is used for duplicating the reference source of the reference current source into second current in a proportional relation way; and an output impeder of the second current mirror circuit is connected in parallel with the capacitor, and is connected in series with the output end of the first current mirror circuit. Due to the adoption of the power-on reset circuit disclosed by the invention, low power consumption and small area can be realized, and wide reset pulse bands can be generated in a large power-on speed range.

The present invention provides a pneumatic tyre capable of evenly improving steering stability on a dry roadway and performance on snow. The pneumatic tyre (1) is provided with a pair of tyre shoulder main channels (3) and a center main channel (4) at a tyre surface part (2), so as to obtain a pair of tyre shoulder land parts (7) and a pair of center land parts (8). The ratio W1 / W2 of the width W1 of the tyre shoulder land part (7) and the width W2 of the center land part (8) is 1.2-1.6. The center land parts (8) are provided with a plurality of center shallow channels (12) which extend obliquely relative to the axial direction of the tyre from the tyre shoulder main channels (3) and form terminals in the center land parts (8). The tyre shoulder land parts (7) are provided with, at the side of the tyre shoulder main channels (3), tyre shoulder accessory channels (28) which have the channel width less than the channel width of the tyre shoulder main channels (3) and extend continuously along the circumferential direction of the tyre.

The invention discloses an edge pressing sample trimmer. A receding groove is formed in the upper surface of a base of the trimmer, a trimming width positioning block is installed inside the receding groove, two fixing seats are arranged on the upper surface of the base, two guide pillars and a sliding block are arranged between the two fixing seats, a blade fixing bock is arranged under the sliding block and provided with trimming blades, and the trimming blades are fixed though a blade clamping block. When the edge pressing sample trimmer works, the sliding block is pushed so that the blade fixing block and the two trimming blades can move forwards, and the two trimming blades finish the trimming operation on corrugated paper through trimming blade edges. The trimming blade edges are respectively of a single-edge structure, and the edge surfaces are outward, and the trimming blade edges of the single-edge structure can guarantee the perpendicularity between a trimming surface of the corrugated paper and the surface of a sample. The invention further discloses a trimming method which comprises the steps of putting the corrugated paper, positioning the corrugated paper, trimming the corrugated paper, driving a handle to reset, taking down the sample and the like, and the above steps can guarantee the perpendicularity between the trimming surface of the corrugated paper and the surface of the sample and the consistency of the width of the sample.