43 results about "Reverse diffusion" patented technology

The present invention provides an oxygen sensor which comprises the following components: an electrolyte interlayer (110) which is provided with at least one through hole; a measuring electrode (112) which is arranged at one side of the electrolyte interlayer; and a counter electrode (114) which is arranged at the other side of the electrolyte interlayer. The dimension of at least one through hole satisfies the following relationship: A<liquid phase> / l<interlayer> <6.5*10<3>(A<entry> / l<entry>), wherein A<liquid phase> is the total sectional area of at least one through hole, l<interlayer> is the thickness of the through hole, A<entry> is the sectional area of the air inlet hole, and A<entry> is the length of the air inlet hole. The through hole can comprise a hydrophilic liquid-absorptionmaterial. The position is departed from the electric field formed by the measuring electrode and the counter electrode. The electrolyte interlayer can also be a hydrophilic micropore array formwork. In the oxygen sensor of the invention, the electrolyte interlayer structure which is provided with at least one through hole not only can be taken as an ion conductor for communicating the measuring electrode with the counter electrode but also can prevent the reverse diffusion of the oxygen. At the same time, the prepared oxygen sensor not only has excellent interference resistance but also has the advantage small volume.

A common pilot channel-use reverse diffusion unit generates common pilot data using a received digital signal and a common pilot channel-use reverse diffusion code, while an individual channel-use reverse diffusion unit generates individual channel data using the received digital signal and an individual channel-use reverse diffusion code. Power calculating unit converts respective output data items of the common pilot channel-use reverse diffusion unit and the individual channel-use reverse diffusion unit into power values, a larger one of which is then determined by a comparator. A selector unit selects the data item having thus determined larger power value of those output data items of those reverse diffusion units. A channel estimating unit estimates the channel using data symbols of the data item thus selected by the selector unit.

The invention discloses a high-performance Janus forward osmosis membrane, comprising a first surface of a super-hydrophilic polymer microporous membrane, a polymer membrane matrix intermediate layerand a second surface away from the first surface and coated with a super-hydrophobic inorganic nanoparticle coating, wherein the water droplet infiltration time of the first surface of the super-hydrophilic polymer microporous membrane is less than two seconds, and the second surface coated with the super-hydrophobic inorganic nanoparticle coating has a water droplet contact angle of greater than150 degrees. The Janus forward osmosis membrane has the advantage of high water flux and low-salt reverse diffusion flux.

The invention discloses a method for generating a color garbage classification two-dimensional code. The method comprises the steps of coding the garbage bag identity information to generate a uniquegarbage bag identity code; extracting an identity display code and an identity hiding code, and respectively converting the identity display code and the identity hiding code into the numerical data;respectively calculating to obtain an initial value, parameters, an initial iteration step number and an extraction interval of the chaotic system, and performing iteration on the Logistic chaotic mapping to generate a chaotic sequence; respectively scrambling the ciphertext numerical values in the three custom numerical value type data and ciphertext numerical value corresponding relation tables;and meanwhile, carrying out the corresponding forward diffusion encryption and reverse diffusion encryption on different numerical values of the identity hidden code conversion data, generating an identity hidden encryption code according to the scrambled corresponding relation table, and then generating a garbage classification code through combination, so that the color garbage classification two-dimensional code is obtained. The method for generating the color garbage classification two-dimensional code provided by the invention is simple and feasible, has very strong safety and is not easy to crack, and the generated color garbage classification two-dimensional code is convenient for guiding garbage classification, can effectively protect the privacy of the user in garbage bag identity hidden information, and has the uniqueness and safety.

The invention provides an image encryption method and apparatus. According to the method, by adopting a target image matrix of sparse representation according to a preset orthogonal sparse base and anoriginal image matrix of a plaintext image, the computational complexity is reduced. A measurement result matrix is obtained by performing compression measurement on the target image matrix through acompressed sensing model, wherein the compressed sensing model is obtained by performing tensor product processing according to a chaotic matrix and a generalized permutation matrix; and the compressed sensing model is obtained by performing the tensor product processing by matrixes generated by two chaotic systems separately, so the compressed sensing model has interrelation that is small enough, and thus the possibility of successful restoration is improved. Quantitative processing is performed on the measurement result matrix to obtain a quantitative matrix subjected to the quantitative processing; and forward diffusion processing and reverse diffusion processing are performed on the quantitative matrix to obtain an encrypted image matrix, the encrypted image matrix corresponds to a ciphertext image, and the forward diffusion processing and the reverse diffusion processing can ensure more uniform image energy distribution and further improve the system security and the image encryption performance.

A diffusion code reporting unit reports diffusion codes corresponding to communicating mobile station devices to respective mobile station devices, a separation unit separates, from a received signal, information indicating an interference station detected from reverse-diffusion results in respective mobile station devices, and a control unit reduces the transmission power of a signal to the interference station.

The invention relates to a reverse freezing method of polycrystalline silicon, and belongs to the field of polycrystalline silicon production. The rapid freezing method of polycrystalline silicon comprises the steps of preparing materials, smelting and freezing. The freezing method comprises the following steps of: directionally freezing silicon liquid in a polycrystalline silicon reverse freezing device until the volume of remained silicon liquid is 1-25% of the initial volume; and contacting a water cooling copper plate at 0-500 DEG C with the remained silicon liquid until the remained silicon liquid is frozen. By adopting the rapid freezing method of polycrystalline silicon, strong condensate depression is formed after the water cooling copper plate enters the upper surface of silicon liquid, so that silicon liquid can be frozen rapidly and large stress is formed to break easily, reverse diffusion of impurities is inhibited and post processing is facilitated.

The invention discloses an active carbon box sampler with a diffusion barrier, which comprises a circular aluminum cover with a cover, the diffusion barrier, a stainless steel pressing sheet, a stainless steel net, a location snap ring and active carbon, wherein the active carbon is arranged in the aluminum box, the stainless steel net is placed on the active carbon, and the stainless steel pressing sheet provided with the diffusion barrier is placed on the stainless steel net and is located by the location snap ring and then sealed by the cover. In the invention, the sampling efficiency is increased through selecting the active carbon with high radon adsorption efficiency, the influence of water in the air to a detection result is reduced through additionally arranging the diffusion barrier and changing the structure of the sample, and reverse diffusion of radon is reduced; and the concentration of the radon in a room is detected by using the sampler disclosed by the invention, thus the reliability of the detection result is improved. The sampler is suitable for massively detecting the radon in the room for a current construction project, and has the advantages of stable detection result, simplicity in operation, saving of a great quantity of manpower works, and the like.

The invention relates to a selective doping method for a solar cell based on reverse diffusion. The method includes the steps: diffusing a silicon slice in an aerobic environment at a high temperature to form a PN junction and oxidizing the upper surface of the silicon slice; removing an oxidation layer outside a top electrode area of the silicon slice; depositing an intrinsic amorphous silicon layer on the upper surface of the silicon slice; diffusing the silicon slice in a wet-oxygen environment at a high temperature, reversely diffusing doping elements in a non-top electrode area into the amorphous silicon layer, diffusing doping elements in an oxidation layer of the top electrode area to the top electrode area and oxidizing the amorphous silicon layer and the non-top electrode area of the surface of the silicon slice to form an oxidation layer; and removing the oxidation layer on the surface of the silicon slice to selectively dope the solar cell based on reverse diffusion. By means of reverse diffusion, impurities in the non-top electrode area are absorbed by amorphous silicon, the doping concentration of the non-top electrode area is reduced, the top electrode area is secondarily doped, the doping concentration difference between the top electrode area and the non-top electrode area is further increased, and selective doping effects are improved.

An improved digital halftoning method that uses an input image's global gray levels to determine the local gray levels of a monochrome output image. Input multi-bit pixels grouped into two-pixel-by-two-pixel local subcells are variously aggregated into one or more larger supercells. The size of said supercell(s) is related to and limited by the size of the global input bitmap. A final monochrome gray level is derived from said supercell(s) and distributed within contained subcells. Subcell gray levels are expressed as interim whole monochrome pixels and gray level remainders. A comparison is made of the final supercell and the summed interim subcell monochrome gray levels. An ordering of the remainders is used for assignment of additional monochrome pixels, if necessary, to yield final subcell monochrome gray levels. Gray level rounding errors thus are quantized by reverse diffusion until a monochrome gray level for each of the global image's two-pixel-by-two-pixel local subcells is derived.

The invention discloses a receiving device, a device for generating a modified despreading code and a method for generating the modified despreading code generated by predicting the deformation of the transmitted spreading code in a receiver circuit to perform despreading processing. Wherein, the receiving device (10) includes: a signal receiving device, used to receive the transmitted signal, and obtain the received signal; a filter device, used to remove high-frequency components from the received signal; A / D conversion device, used to convert the filter device The output signal is to generate a digital signal; the inverse diffusion processing device is used to multiply the digital signal and the inverse diffusion symbol to perform inverse diffusion processing; and the inverse diffusion symbol supply device is used to generate the modified inverse diffusion symbol generated based on the deformed diffusion symbol Despread codes are supplied to the despread processing device, wherein the spread codes correspond to the positions where the PSK-modulated signal based on the spread codes included in the received signal is significantly deformed, that is, the positions where the diffuse codes are deformed.

A method for improving the osmosis apparatus with gas separating membrane features that when a constant-pressure volume-varying method is used to measure the gas osmosis of membrane, a vacuumizing method is used at up-stream of membrane pool for exhausting the gas from pipeline and membrane and a capillary soap membrane flowmeter isolated from air is used at the down-stream for measuring the osmotic speed of gas, so effectively preventing the reverse diffusion of gas.

The invention relates to an image encryption method based on hyperchaotic system key dynamic selection, which mainly includes the following steps: arranging the original plaintext images into an image array P, and then using the hyperchaotic system to generate chaotic sequences and grouping them; combining the plaintext-dependent KSSG and KS dynamic selection mechanism to generate forward scrambling key K1, and perform forward scrambling on P to obtain P1; combine KSSG and KS mechanism to generate forward diffusion key K2, and perform forward diffusion on P1 to obtain P2; combine KSSG and KS The dynamic selection mechanism generates reverse scrambling key K3, reverse scrambles P2 to obtain P3; uses KSSG and KS dynamic selection mechanism to generate reverse diffusion key K4, performs reverse diffusion on P3 to obtain P4, and reorganizes P4 That is, the final ciphertext image is obtained. The above method increases the key space, makes the security, the encryption effect and the key sensitivity higher, the anti-attack ability is stronger, and it is easier to realize by hardware.