35results about How to "Guaranteed structural integrity" patented technology

The invention discloses a system upgrade method, an OTA upgrade package encryption method, a terminal device and a vehicle. The system upgrade method comprises the following steps: obtaining description information of an over-the-air technology based OTA upgrade package, wherein the description information comprises a key, an OTA public key, an OTA public key signature, and a digest signature of the OTA upgrade package; downloading an OTA upgrade package encrypted by the key; decrypting the OTA upgrade package by the key; verifying the legality of the decrypted OTA upgrade package by using a pre-configured root public key, the OTA public key signature, and the digest signature of the OTA upgrade package; and storing the decrypted OTA upgrade package, and performing system upgrade accordingto the decrypted OTA upgrade package if the OTA upgrade package is judged to be legal. The system upgrade method can ensure that the OTA upgrade package is not easily maliciously changed during the transmission process, and can ensure the integrity of the upgrade package, so as to verify the accuracy, thereby improving the security of the system upgrade.

The invention relates to a manufacturing process of a large-size thin-walled cylinder body, comprising the following steps of: inputting the front end of a steel plate with the thickness meeting requirements into a three-roller plate bending machine, and bending the steel plate into an arc shape through a compression roller by the three-roller plate bending machine; arranging a bracket at one side of the three-roller plate bending machine, arranging a carrier roller on the bracket, wherein the carrier roller is arranged parallel to the compression roller of the three-roller plate bending machine, and the height of the carrier roller corresponds to the diameter of an opening of the large-size thin-walled cylinder body; enabling the steel plate to ascend from the outlet end of the three-roller plate bending machine under the thrust action of the three-roller plate bending machine during bending and keep a same arc all the time in the bending process, and enabling the front end of the steel plate to be naturally overlapped with the carrier roller after reaching a highest point and then continuously downwards bent back to the inlet end of the three-roller plate bending machine; connecting divided edges of the front end and the rear end of the large-size thin-walled cylinder body which is completely bent in a parallel and level way, and also fixing through spot welding; and welding to form a circular cylinder body. The invention can effectively control the deformation of the cylinder body in the manufacturing process by utilizing a principle of the action of one support on a circumference, is more convenient and faster to assemble, effectively reduces the manufacturing cost and has very good popularization value.

The invention relates to a graphene/boron carbide ceramic composite material and a preparation method thereof. The preparation method specifically comprises steps as follows: 1), graphene oxide, boroncarbide and a sintering aid are added to an organic solvent and mixed uniformly, and a graphene oxide/boron carbide dispersion liquid is obtained; 2), after the graphene oxide/boron carbide dispersion liquid is subjected to ball-mill mixing by a ball mill, a product is subjected to spray granulation, and graphene oxide/boron carbide mixed powder is obtained; 3), the graphene oxide/boron carbide mixed powder is placed in a die and subjected to hot-press reaction sintering, and the graphene/boron carbide ceramic composite material is obtained after cooling, wherein compactness of the material is higher than or equal to 98%, bending strength is higher than or equal to 350 MPa, hardness is higher than or equal to 29 GPa, and fracture toughness is higher than or equal to 5 MPa.m<1/2>. Comparedwith the prior art, agglomeration in the sintering process is avoided, comprehensive performance of the material is excellent, the preparation process is simple, and follow-up electric spark machining is facilitated.

The invention discloses a double-acting double-pipe single-bit coring drilling tool and an application method thereof, and belongs to the field of geological exploration boring machines. The double-acting double-pipe single-bit coring drilling tool comprises an inner-outer core barrel connector, an outer pipe, an inner pipe and a drill bit body arranged at one end of the inner pipe. The outer pipe and the inner pipe are fixed to the inner-outer core barrel connector. An annular gap is reserved between the outer pipe and the inner pipe. A water dividing hole is formed in the inner-outer core barrel connector. Four to eight flange ribs are uniformly distributed on the outer side face of the drill bit body and each provided with a step. The steps of the flange ribs are sleeved with the end of the outer pipe. A row of hard alloy drill bits is embedded in the bottom face of the drill bit body, and a row of hard alloy drill bits are embedded in the bottom faces of the flange ribs. The coaxiality and the integral rigidity of the drilling tool are improved by means of the flange rib type drill bits, and vibration of the drilling tool during drilling is reduced; in addition, the rock core sampling quality and efficiency of quaternary loose strata, bed rock weathering zones and coal seam outcrops are remarkably improved; and meanwhile, the drilling efficiency is improved.

The invention provides an efficient preparation method of a boron nitride nanosheet and organic dispersion liquid thereof. The efficient preparation method comprises the following steps: a first step, adding boron nitride powder A, polymer and an organic solvent D in proportion, sealing, and then carrying out ultrasonic treatment to obtain initial dispersion liquid E, wherein the polymer is at least one of hyperbranched polyethylene B and hyperbranched polyethylene copolymer C; a second step, fully standing or centrifuging the initial dispersion liquid E obtained from the step 1 at low speed to obtain BNNSs dispersion liquid F containing excessive polymer; a third step, carrying out high-speed centrifuging or vacuum suction filtration and drying on the BNNSs dispersion liquid F containing the excessive polymer obtained from the step 2 to obtain a boron nitride nanosheet G; and a fourth step, adding the boron nitride nanosheet powder G and an organic solvent H which are obtained from the step 3 in the container, sealing and then carrying out ultrasonic treatment to obtain the boron nitride nanosheet dispersion liquid. By the efficient preparation method of the boron nitride nanosheet and the organic dispersion liquid thereof, the low-defect boron nitride nanosheet and the dispersion liquid thereof are effectively prepared controllably at low cost.

The invention discloses a non-destructive testing method of internal structure of cigarettes during burning. The method comprises the steps as follows: placing a cigarette sample in a CT scanner to be scanned to obtain an internal structure of the cigarette sample before burning; igniting the cigarette sample for static burning or normal suction to produce ash; placing the cigarette sample after ash is produced in a closed container to be extinguished, and freezing the cigarette sample; scanning the frozen cigarette sample by the CT scanner to obtain the internal structure of the burnt cigarette, and calculating the change of the internal structure of the cigarette sample before and after burning. With the adoption of the method, the change of the internal structure of the cigarettes in the real burning state can be obtained by analyzing the internal structure of the cigarette sample before and after burning, and the visual basis is provided for further study of the burning process of the cigarettes.

The invention discloses application of a traditional Chinese medicine composition serving as a preparation for treating dental ulcer. An animal experiment proves that the traditional Chinese medicine composition disclosed by the patient CN101940630A can effectively reduce big guinea pig dental ulcer degree caused by phenol simulation or fulguration and model rats and the hydroxyproline content of guinea pig buccal membrane tissues and promote ulcer healing, the medicine effect is slightly higher than that of the same dosage of mirabilitum praeparatum preparation. Pathological tissue checking further proves that the positive effects of inhibiting inflammatory cell infiltration and keeping the completeness of the epithelial tissue structure are achieved, and dental ulcer can be effectively treated.

The invention discloses a pig feed additive for improving immunity and a pig feed with the same. The pig feed additive is prepared from, by weight, 2-20 parts of a rhizoma imperatae extraction solution, 0.3-1 part of folic acid, 0.05-0.3 part of vitamin B12 and 1-3 parts of a probiotics compound preparation; the probiotics compound preparation is prepared from 2-5*10<9> CFU/g lactic acid bacteria,0.8-1.5*10<8> CFU/g saccharomyces cerevisiae and 2-5*10<9> CFU/g bacillus subtilis. The pig feed additive has the advantages that nutrients required for the growth of live pigs are reasonably configured according to the growth characteristics of the live pigs, and the production performance and immunity of the live pigs can be effectively improved.

The invention belongs to the field of environmental engineering materials and particularly relates to an anaerobic immobilized bacterial preparation, as well as a preparation method and application thereof. The preparation method comprises the following steps: preparing corresponding culture bacterial solutions from four different anaerobic functional strains by utilizing a pure bacterial culturetechnology; mixing the four culture bacterial solutions in a certain volume ratio to obtain a compound functional bacterial solution; concentrating the compound functional bacterial solution into functional flora precipitation, and dissolving the functional flora precipitation in an polyvinyl alcohol aqueous solution; dropping the solution into a first buffer solution to obtain polyvinyl alcohol gel beads; and putting the gel beads into a second buffer solution containing sulfate to obtain sulfate modified polyvinyl alcohol gel beads, namely the anaerobic immobilized bacterial preparation. Thepreparation method is simple, has low energy consumption; and the anaerobic immobilized bacterial preparation is acid-resistant and ammonia-resistant, can remarkably enhance the treatment performanceof flora inside an anaerobic digestion reactor on accumulated organic acid and solves the problems of functional strain loss and poor self-healing performance of anaerobic flora.

The invention provides a Christmas tree branch integrated molding injection molding process, which comprises the following steps: assembling a male mold and a female mold, forming a feeding hole on at least one of the male mold and the female mold, forming N cavities after the male mold and the female mold are assembled, communicating the feeding hole with at least one of the N cavities, and communicating one cavity with the other N-1 cavities, wherein N is a natural number greater than or equal to 2; inserting N metal strips with PE and/or PVC leaves into the N cavities respectively; injecting hot melt plastic from the feeding hole, and filling the N cavities with the hot melt plastic; cooling the hot melt plastic, and forming Christmas tree branches in the N cavities; and demolding the male mold and the female mold, and taking out the molded Christmas tree branches. The male mold and the female mold are assembled, the long strip with the PE/PVC leaves is inserted into at least two communicated cavities, the cavities are filled with molten plastic, branch bodies and branches of the formed Christmas tree branches are fixedly connected through the molten plastic, the branches cannot be separated from the branch bodies even if the branches shake violently, and the structural integrity of a Christmas tree is guaranteed.

The invention discloses an extraction method of pear leaf protoplast, and belongs to the technical field of protoplast. The method adopts pear tissue culture seedling leaves, solves the problems that field seedlings are easy to brown and complete protoplast cannot be prepared, and breaks the bottleneck of pear protoplast preparation; the enzymatic hydrolysate is adopted, so that the extraction efficiency is improved and the structural integrity of the protoplast is ensured; and the pear leaf protoplast prepared by the method can improve the concentration of the protoplast and maintain the integrity and activity of the protoplast, and the concentration of the prepared pear leaf protoplast can reach 106 parts/ml.

The invention discloses application of sinomenine in prevention and treatment of soybean meal-induced fish enteritis and liver inflammation, and speculates that sinomenine is a potential drug for prevention and treatment of soybean meal-induced enterohepatitis in combination with intestinal tissue transcriptome results of grass carp disease modelling and integrated bioinformatics analysis. Zebra fish animal tests prove that sinomenine inhibits intestinal inflammation and relieves liver lesions (fatty liver or fibrosis) through feed addition, so that enterohepatitis caused by the soybean meal feed is relieved; meanwhile, growth is recovered from the perspective of increasing the fat content of the trunk of a fish body; and thus, the sinomenine can be used as a novel feed additive with an anti-enterohepatitis effect.