41results about How to "Strong compression resistance" patented technology

The invention discloses a stress absorption band and a construction method thereof. The stress absorption band (3) is arranged at the joint part of a new road (2) and an old road (1), namely from the top surface of a roadbed to the underside of a newly paved oil surface, the stress absorption band (3) is arranged into an inverse trapezoid or an inverse triangular groove, and the groove is filled with asphalt macadam or modified asphalt macadam. The invention also discloses the construction method for the stress absorption band. The stress absorption band (3) is arranged at the joint part of the new road and the old road, can absorb and reduce stress, and prevent road surface diseases caused by the stress at the joint part of the new road and the old road.

A method for watermarking a sequence of images is provided. The method implements the following steps, for at least one current image: comparing the current image with a preceding image of the sequence, delivering a difference image representing a motion between the preceding image and the current image; if the difference between the current image and the preceding image is above a predetermined threshold, watermarking the current image by inserting a message comprising a field carrying an identifier of the current image and a field carrying a soft hash obtained from at least one portion of the difference image; and if not, watermarking the current image by inserting a message comprising a field carrying an identifier of the current image.

The invention discloses a method for hiding high-capacity compression-resisting image information; a criterion for classifying sub-images is provided, before embedding the information, carrier sub-images are classified according to characteristics thereof, the optimal sub-image is selected out to hide information, and thereby information hiding performance is effectively improved. In order to further increase robustness of information hiding, a method of reinforcing bit is skillfully provided, correctness of extracting secret information can still be ensured under the condition of being compressed at a large compression ratio, the maximal relative hiding capacity can be up to 1/8, and the maximal compression-resisting time can be up to 20 times and even higher. The secret information and the carrier images can be recovered in a high-quality mode under the condition of achieving two-time compression to sixteen-time compression of a JPEG2000 algorithm, wherein the typical value of PSNR of the recovered carrier image is 40dB.

The invention discloses magnetic polystyrene foam. Foam serves as a load matrix, the surface of the foam is loaded with a polystyrene slice layer and Fe3O4 nano-particles covered with hollow oleic acid, interconnected high-hydrophobic materials of a three-dimensional network structure are provided, and the loaded polystyrene slice layer and the loaded super-paramagnetic Fe3O4 nano-particles covered with the hollow oleic acid serve as adsorption and magnetic recovery carriers. The Fe3O4 nano-particles covered with the hollow oleic acid are ultrasonically dispersed in an ethanol solution, the foam is immersed in a uniformly-mixed solution of the Fe3O4 particles covered with the hollow oleic acid to be ultrasonically dispersed, magnetic foam is obtained, the magnetic foam is added and dissolved in a sodium dodecyl benzene sulfonate solution to be ultrasonically homogenized, styrene and divinylbenzene are added under the N2 atmosphere, a polymerization reaction is conducted under the effect of an initiator, namely, 2,2'-azobisisobutyronitrile, and finally the magnetic polystyrene foam is obtained. The cyclic utilization rate of the magnetic polystyrene foam is high, the heat stability of an oil absorption material is enhanced, and the application range of the material is widened.

The invention relates to an anionic surfactant for a micro-foam drilling fluid and a preparation method thereof. The anionic surfactant is obtained by mixing a long-chain vinyl monomer A, a carboxyl-containing monomer B and a sulfo-group-containing monomer C according to the mass ratio of 10:1-10:1-10, adding a relative-molecular-mass adjusting agent and performing free radical polymerization. The average relative molecular mass of the anionic surfactant is 1000-10000. The preparation method is simple and practicable, the obtained surfactant is good in foaming performance and high in foam stability, is capable of guaranteeing that the micro-foam drilling fluid has relatively low circulation density at a well-bottom high pressure, and is beneficial for reducing downhole complications.

The invention relates to a cationic surfactant for a micro-foam drilling fluid and a preparation method thereof. The cationic surfactant is obtained by a vinyl cationic monomer A and a vinyl amide compound B according to the mass ratio of 10:1-10, adding a relative-molecular-mass adjusting agent and performing free radical polymerization. The average relative molecular mass of the cationic surfactant is 1000-4000. The preparation method is simple and practicable, the obtained surfactant is good in foaming performance and high in foam stability when being applied to the micro-foam drilling fluid, is capable of guaranteeing that the micro-foam drilling fluid has relatively low circulation density at a well-bottom high pressure, and is beneficial for reducing downhole complications.

The invention discloses a deep dewatering method for sludge. Persulfate, soluble bivalent iron salt and biomass are successively added to the sludge, and a mud cake is obtained by pressure filtrationafter full reaction. The sludge is compounded and conditioned by activated persulfate oxidation and the biomass as a skeleton structure to enhance the strength of sludge flocs, improve the compressibility of the sludge, significantly improve the dewatering performance of the sludge and simultaneously stabilize and deactivate heavy metals in the sludge.

The invention provides an image resampling operation interpolation type identification method. The method comprises the following steps: establishing an image resampling operation expression model; performing an initial blind deconvolution operation on an image subjected to resampling to obtain an initial kernel; figuring out initial kernels with different sizes to obtain a group of convolution kernel set with multiple scales and different sizes; performing convolution on a convolution kernel in the convolution kernel set and an original image corresponding to the convolution kernel, and comparing the original image with the image subjected to resampling, wherein an optimal kernel with the minimum quality difference is the system output; displaying the optimal kernel H* as a column vector; putting the column vector in a classifier to train a model to obtain a classification model; and repeating the processes of step 1 to step 5 on a to-be-measured image, and testing the obtained column vector in the classification model obtained in step 6 to obtain a final detection result. The image resampling operation interpolation type identification method provided by the invention has the advantages of low detection feature dimension, capability of effectively shorten the training time of a classifier of a support vector machine (SVM), high compression resistance and excellent detection accuracy.

The invention discloses a novel bar code screenshot steganography traceability combination algorithm, and belongs to the technical field of information identification. The method comprises the following specific steps: (1) performing starting; (2) analyzing image compatibility; (3) generating fingerprints; (4) performing image segmentation and steganography; (5) performing merging and adjusting; (6) performing ending. According to the invention, through Fourier steganography, LSB steganography and color overlay steganography technologies, on the premise that the bar code is not modified and image changes which can be distinguished by human eyes are not generated, specified character information is written into the picture containing the bar code, and corresponding information can be traced back according to the screenshot after the screenshot is carried out; the method has the effects of high robustness and high compression resistance, and is favorably applied to a platform with a confidentiality requirement, so that information leakage is effectively prevented and blocked.

The invention belongs to the field of construction of floors of outdoor sports places, and particularly relates to a polyurethane compression-tolerant floor structure and a construction method thereof. The polyurethane compression-tolerant floor structure is provided with a layer of aluminum plastic plate around track and field equipment, a rigid base layer and a gypsum-based leveling layer are paved at the periphery of the aluminum plastic plate from bottom to top, and a polyurethane elastic material intermediate coating and a water borne polyurethane top coating are arranged above the aluminum plastic plate and the gypsum-based leveling layer. The structure disclosed by the invention can effectively relieve the heavy pressure of track and field equipment to the floor during use, and the hollowing and cracking of the floor around the track and field equipment is avoided.

The invention provides a surfactant for drilling fluid and a preparation method of the surfactant. The surfactant is prepared from raw materials as follows: mineral oil, n-butyl alcohol oleate, liquidparaffin, methyl silicone oil, an emulsifier and ethyl p-hydroxybenzoate, wherein the mineral oil is one or two of No.5 white oil and No.7 white oil. The preparation method comprises steps as follows: the mineral oil, n-butyl alcohol oleate, liquid paraffin, methyl silicone oil and the emulsifier are added to a reactor and are sufficiently mixed and stirred; the materials in the reactor are heated and emulsified; ethyl p-hydroxybenzoate is added at certain temperature, the materials are sufficiently mixed and stirred, and the surfactant is obtained after cooling. The surfactant is good in performance and prepared with a simple process, has higher resistance to compression and guarantees that the drilling fluid has lower circulating density and higher suspended rock debris carrying capacity at the shaft bottom under high pressure, complex underground accidents are avoided or reduced effectively, and drilling quality and efficiency are improved; the surfactant still has good performanceat high temperature, can be resistant to 10% compound brine pollution and has good inhibiting performance for lubrication.

The invention belongs to the technical field of metamaterial structures, and discloses a three-dimensional negative Poisson's ratio structure, an additive manufacturing method, a 3D printer and an application, and the isotropic three-dimensional negative Poisson's ratio structure is obtained by arraying a plurality of basic unit bodies. Each unit body is provided with a hollow inner concave body and six connecting bridges; eight vertexes of the hollow inner concave body are in the shape of a triangular bearing table in three directions respectively, and the middles of the six inner concave surfaces are in the shape of a square bearing table; and one ends of the six connecting bridges are connected with the square bearing table in the middles of the inner concave surfaces, and the other ends extend out of the hollow inner concave bodies. The three-dimensional negative Poisson's ratio structure with the isotropic height in each direction is highly symmetrical in each direction, does not show mechanical property difference due to different directions, has the characteristics of isotropic height in each direction and good multi-working-condition penetration resistance, and can show a negative Poisson's ratio effect in each direction.

The invention relates to a base, a ball picking device with the base, a mold for manufacturing the base and a manufacturing method of the base and belongs to the technical field of ball picking devices. The base comprises a first connecting device and a ball collecting device; the first connecting device is fixedly connected to one side of the ball collecting device; the ball picking device with the base comprises the base, a telescopic rod and a blocking edge; the telescopic rod and the base are detachably connected, and the blocking edge and the base are detachably connected; the mold for manufacturing the base comprises a top mold body and a bottom mold body which are connected in a clamped combination manner; and the method for manufacturing the base includes the following steps of material preparation, material injection molding and external stress eliminating. The ball picking device is resistant to abrasion, not prone to deformation and long in service life, the manufacturing method is simplified, and a mold for manufacturing the ball picking device is convenient to use, and is a mold through which ball picking devices can be produced on a large scale.