36results about How to "Strong anisotropy" patented technology

The invention discloses an SAR image speckle suppression method based on second generation curvilinear wave transformation, which mainly overcomes the defect of scratch effect and point target loss brought by a curvilinear wave to the SAR image speckle suppression. The SAR image speckle suppression method comprises the following steps: performing the second generation curvilinear wave transformation to a selected test image and partitioning the selected test image into 5 layers of subbands; keeping coefficients of the first layer unchangeable and zero-setting coefficients of the fifth layer; respectively evaluating parameter vectors of hybrid Gaussian models from the second layer to the fourth layer by an EM method; marking the coefficients from the second layer to the fourth layer; reconstructing the image, detecting the edge of the reconstructed image, and performing the average filtering to the uniform area of the reconstructed image to obtain the filtered image; and performing the nonlinear anisotropy dispersion iteration to a difference image obtained by the original image and the filtered image to obtain a speckle suppressed image. The invention has the advantages of keeping clean edge of the image, removing the scratch effect and remaining the point target characteristic information of the image, and can be used for preprocessing scene analysis and image understanding in the SAR image.

The invention relates to a forging process for eliminating anisotropism of a large-sized AQ80M magnesium alloy bearing member and belongs to the technical field of magnesium alloy material machining. The process specifically includes the steps that an ingot blank is prepared; extrusion blooming is performed with the low extrusion ratio, specifically, extrusion is performed on an extruding machine with the extrusion ratio being 3-4 and the extrusion speed being 0.3-2.8 mm/s; cooperating with intermediate annealing, multiple passes of direction-changing heading are performed on a hydraulic press so that the blank can be forged into a large-sized magnesium alloy bearing member; and the magnesium alloy bearing member is subjected to aging treatment. By means of the forging process, preparation of magnesium alloy bearing members with the size being larger than 470*390*170 mm<3> can be achieved; after aging treatment is finished, the yield strength difference among the length direction, the width direction and the height direction is smaller than or equal to 10 MPa at both the room temperature and the temperature of 150 DEG C; and the problem of anisotropism of large-sized magnesium alloy parts is solved.

The invention discloses a wood and bamboo-unfolded thick veneer collection laminated material with fast-growing woods and mao bamboos as raw materials and a preparation method of the wood and bamboo-unfolded thick veneer collection laminated material. The wood and bamboo unfolded thick veneer collection laminated material comprises at least three layers of odd wood laminated veneers and bamboo unfolded thick veneers, wherein the wood laminated veneers and the bamboo unfolded thick veneers are alternately and hierarchically stacked and are bonded and pressed into an integrated body through adhesive agents; the wood laminated veneers are distributed on both a surface layer and a bottom layer of the integrated body; and all the veneer layers are longitudinally arranged or horizontally and longitudinally arranged. The bamboo-unfolded thick veneers are formed in a way that every two of ladder-shaped unfolded bamboo plate unit bodies formed by unfolding original arc-shaped bamboo blocks correspond to each other in a turned way and are longitudinally laminated. According to the wood and bamboo-unfolded thick veneer collection laminated material provided by the invention, the production process is simplified, the production cost is reduced, the raw material consumption of unit product is controlled, the benefits of woods and bamboos are fully exerted, the mechanical property of wood and bamboo compound materials is improved, and the application range is widened.

The invention relates to a swaging integrated forming process for a large-diameter AQ80M magnesium alloy cake material, and belongs to the technical field of processing of a magnesium alloy material. The process comprises the following specific steps: preparing an AQ80M magnesium alloy ingot blank by semi-continuous casting; heating an extrusion die and an extrusion barrel; carrying out extrusion pre-deformation at low extrusion ratio; straightening and cutting the blank; carrying out multi-directional forging forming; and carrying out aging treatment. By the swaging integrated forming process for the large-diameter AQ80M magnesium alloy cake material, the large-diameter magnesium alloy cake material of which the diameter is phi 690 mm to phi 700 mm, the thickness is 100-110 mm, the tensile strength is greater than or equal to 330 MPa, the yield strength is greater than or equal to 190 MPa and the ductility is greater than or equal to 6% at room temperature, and the tensile strength is greater than or equal to 200 MPa, the yield strength is greater than or equal to 160 MPa and the ductility is greater than or equal to 30% at the temperature of 150 DEG C. The prepared large-size magnesium alloy cake material completely meets requirements of a large magnesium alloy part.

The invention relates to the field of new materials, in particular to a novel metal crystal whisker material and a method for preparing metal tin (Sn) crystal whiskers, which solve the problems of high requirements on crystal whisker production equipment, complex crystal whisker preparation process, high price of the crystal whisker and the like. The method comprises the following steps of: smelting tin (Sn) and rear earth elements (neodymium (Nd), cerium (Ce) and lanthanum (La)) into an Sn-RE compound; smashing the Sn-RE compound into powder which is taken as a parent material for growing the Sn crystal whiskers; and after the Sn-RE compound powder is stored under the atmospheric conditions at the room temperature for a certain time, triggering the Sn crystal whiskers to spontaneously grow on the parent material by chemical reaction of automatic decomposition of the Sn-RE compound under the atmospheric conditions to obtain the Sn crystal whisker material. In the method, the growth process of the crystal whiskers is controlled by mainly controlling the growth time, namely the whisker growth condition can be suitable for natural environments of different places, and corresponding production equipment and temperature and moisture control conditions are not needed, so the production cost of the crystal whiskers can be effectively controlled.

The invention discloses a method for evaluating fracturing property of a complex reservoir, and particularly relates to the field of oil and gas exploration and development of complex reservoirs. Themethod comprises the following steps: selecting a plurality of rock core samples in a complex reservoir, sequentially carrying out a crustal stress test experiment, a rock triaxial mechanical experiment and a rock damage experiment on one part of the rock core samples, determining the horizontal crustal stress difference, brittleness and residual stress of the rock core samples, carrying out a Brazilian split test on the other part of the rock core samples, determining the fracture toughness and tensile strength of the rock core samples, determining the fitting degree between parameters and the fracture pressure of the rock samples based on regression analysis, calculating weighting coefficients of the parameters, calculating a crack correction factor by utilizing logging data, establishing a complex reservoir fracturing evaluation model by integrating measurement parameters of the rock samples and the crack correction factor, and evaluating the fracturing property of the complex reservoir. According to the method, the accuracy of evaluation of the fracturing property of the complex reservoir is improved, and efficient development of complex oil and gas resources is facilitated.

The invention relates to a carbon negative electrode material of a lithium-ion battery with long cycle life and a preparation method of the carbon negative electrode material. The material has a multi-layer carbon shell structure, and carbon shells are in spherical-like concentric arrangement and have a spherical shape and the diameters are 0.5-30 microns. The carbon material is prepared through low-temperature thermal treatment and high-temperature thermal treatment on a precursor which is prepared by chemical vapor pyrolysis or through carbon particles by a resin coating method. The carbon material has charge and discharge behaviors similar to a graphite negative electrode material, overlong cycling stability, more excellent charge and discharge capacity and high rate capability when used as the negative electrode material of the lithium-ion battery.

The invention provides a preparation method of a high-manganese alloy film Mn53Ni23Ga24. The preparation method comprises the following steps: taking metal simple substances, namely Mn, Ni and Ga as target raw materials with the mole fraction ratio of Mn to Ni to Ga being 53:23:24, placing the target raw materials in a non-consumable vacuum arc furnace for smelting, vacuumizing to 5*10<-3>Pa, and then introducing shielding gas, so as to obtain a round target material; placing a pre-processed base plate and the target material in a vacuum system, and vacuumizing to 1.0*10<-4>Pa, wherein the temperature of the base plate is 500-700 DEG C, and the interval between the base plate and the target material is 3-5 cm; emitting lasers by a laser device, controlling the frequency to be 3-4 Hz, and sputtering for 1-3 hours, so as to prepare a film with required thickness; finally, annealing the film at the temperature of 800-900 DEG C, so as to obtain the high-manganese alloy film Mn53Ni23Ga24. According to the Mn53Ni23Ga24 alloy film prepared by the preparation method, the components are more precise, the roughness is low, the surface is smoother, the anisotropism is good, the martensite phase transformation temperature of the film is equivalent to that of block materials, required raw materials are low in price and rich in reserves, and the prepared alloy film is excellent in tenacity, high in strength, simple in technology, and easy for industrial production.

The invention discloses a method for forming a polycrystalline structure welding spot by prefabricating an IMC bonding pad, and belongs to the technical field of material preparation and connection, the polycrystalline structure welding spot is formed by prefabricating the IMC bonding pad, and the method comprises the key steps that a welding ball is remelted and cooled on the prefabricated IMC bonding pad; the condition that the reliability and the service life of a Sn-based brazing filler metal welding spot are reduced due to anisotropy of Sn can be improved, and the welding spot is determined to be a polycrystalline structure welding spot through the EBSD technology. Therefore, the polycrystalline structure welding spots can effectively reduce the condition of unfavorable Sn grain orientation; the process is simple, the cost is low, and polycrystalline welding spots with controllable welding spot sizes and different grain orientations are manufactured.

The invention belongs to the technical field of ferrite synthesis, and relates to a low-loss soft magnetic ferrite material for 5G and a preparation method thereof. The material comprises 36.8 mol%-38.5 mol% of modified Fe2O3, 26.4 mol%-28.2 mol% of ZnO and the balance of Mn3O4. The soft magnetic ferrite material further comprises additives which comprise at least four of CaCO3, Nb2O5, Bi2O3, V2O5, Co2O3 and MoO3. The soft magnetic ferrite material further comprises a distortion resisting agent. According to the invention, Fe2O3 is modified by wrapping SiC fibers in Fe2O3, the modified raw material can be doped from all directions in the crystal after material transportation and mixing, the doping effect is more obvious, meanwhile, a barrier layer formed by the distortion resisting agent on the surface of the crystal can reduce gaps and also can prevent crystal lattices from deforming, the distortion resisting agent can be volatilized in the subsequent sintering process, so that the ferrite can keep relatively high magnetic conductivity while relatively low dielectric loss is ensured.