36results about How to "Improve freshness" patented technology

The invention relates to the technical field of food fresh-keeping materials, and discloses a preparation method of an intelligent response degradable fruit and vegetable fresh-keeping film based on a Janus structure, the intelligent response degradable fruit and vegetable fresh-keeping film comprises a hydrophobic layer and a hydrophilic layer, the hydrophobic layer is an electrostatic spinning film formed by compounding eugenol-loaded ZIF-8 nano-particles and polylactic acid, and the hydrophilic layer is an electrostatic spinning film formed by compounding eugenol-loaded ZIF-8 nano-particles and polylactic acid. The hydrophilic layer is an electrostatic spinning membrane formed by compounding chitosan and gelatin, the surface of the hydrophobic layer is covered with the hydrophilic layer through an electrostatic spinning technology, the ZIF-8 nanoparticles are synthesized through a room-temperature stirring method, and synthesis raw materials are a 2-methylimidazole methanol solution and a zinc nitrate methanol solution. By means of the pH response characteristic of the ZIF-8 nano-particles, pH value change signals generated in the early stage of fruit and vegetable putrefaction can be sensitively captured, loaded antibacterial components are accurately released through ZIF-8 framework dissociation, targeted inhibition on putrefying bacteria is achieved, passive protection is converted into active intervention, the fruit and vegetable putrefaction process is effectively delayed, the fresh-keeping effect is improved, and the fresh-keeping time is prolonged.

A fruit and vegetable food preservation device based on a composite polysaccharide film, relating to the field of fruit and vegetable food processing technology, includes a first inclined plate (1) and a second inclined plate (6) disposed at the lower inclined end of the first inclined plate (1). The first inclined plate (1) and the second inclined plate (6) are both fixedly connected to the base plate (7) by support columns. A U-shaped frame plate (601), a dispensing mechanism (4) and a heat sealing mechanism (5) are arranged sequentially above the second inclined plate (6) from the upper inclined end to the lower inclined end. The bottom surfaces of both ends of the U-shaped frame plate (601) are fixedly connected to the second inclined plate (6). The dispensing mechanism (4) includes an L-shaped plate (401), a partition plate (402) and a first heating strip (403). Multiple partition plates (402) are arranged in a horizontal array on one side of the opening of the L-shaped plate (401). The upper ends of multiple partition plates (402) are fixedly connected to the same crossbar (4022). The device can quickly and efficiently encapsulate composite polysaccharide films in fruit and vegetable processing, and can also quickly wipe and dehydrate fruits and vegetables after washing, ensuring thorough cleaning and effectively improving the freshness of fruit and vegetable products.

The invention discloses a knowledge index and text generation control method and system for retrieval enhancement generation. The method relates to the technical field of retrieval enhancement generation and comprises the following steps of knowledge index accuracy evaluation, index accuracy intelligent regulation and control, text generation timeliness evaluation and generation timeliness intelligent regulation and control. According to the method, the knowledge index accuracy is evaluated based on the index accurate parameters, and if the knowledge index does not reach the standard, the semantic relevance and the result effectiveness are regulated and optimized in a self-adaptive mode through the window width and the effective proportion. And then, evaluating the text generation timeliness based on generation timeliness parameters, if the text generation timeliness does not reach the standard, dynamically managing dialogue memory and load by updating a rate threshold value and performing adaptive regulation and control of a response period, preferentially guaranteeing the response speed and continuity, and finally performing a text generation verification link. The control timeliness of the knowledge index generated by retrieval enhancement and the text generation is improved, and the problem that the control timeliness of the knowledge index generated by retrieval enhancement and the text generation is low in the prior art is solved.

The utility model discloses a speed changer of toy car, including speed changer body and drive arrangement, speed changer body includes driving rod, conversion subassembly, first gear train subassembly and second gear train subassembly, first gear train subassembly, conversion subassembly and second gear train subassembly are sequentially inserted on driving rod, the output of drive arrangement is connected with the input of driving rod, wherein, when first gear train subassembly is connected with conversion subassembly, driving rod drives first gear train subassembly to rotate, and first gear train subassembly is connected first output through first drive link, and speed changer is in acceleration state, when second gear train subassembly is connected with conversion subassembly, driving rod drives second gear train subassembly to rotate, and second gear train subassembly is connected second output through second drive link, and speed changer is in deceleration state. Children observe the rotation and switching process of gear intuitively in playing. Cultivate their interest in science and technology in the form of play.

This invention relates to a toothpaste flavoring with a long-lasting fresh breath effect and its preparation method. The core component of this toothpaste flavoring is modified menthol. Modified menthol reacts with amino acid compounds to form a menthol-amino acid complex, which is then coated with β-cyclodextrin to form a menthol-amino acid-β-cyclodextrin complex. This dual synergistic effect effectively prolongs the duration of its fresh breath effect. The toothpaste flavoring also includes 2,6-dimethylaniline, flavor enhancers, emulsifiers, stabilizers, aroma retardants, and preservatives to ensure aroma stability and safety for oral use. This invention provides a longer-lasting fresh breath effect, solving the problems of rapid evaporation and short-lasting freshness in traditional toothpaste flavorings, and has good market application prospects.

This invention relates to a hyperbaric oxygen chamber system with adjustable oxygen concentration. The system includes a main unit and a chamber. The main unit comprises a main control module, an oxygen regulation module, and a pressure regulation module, all electrically connected to the main control module. The pressure regulation module includes a low-oxygen air regulation submodule and a pressure-maintaining air submodule. The pressure-maintaining air submodule includes a first air compressor, a pressure relief valve, and a first sensor. The oxygen regulation module includes a second air compressor, a separation valve, a molecular sieve tower, a flow-limiting valve, and a vacuum pump. The low-oxygen air regulation submodule includes a three-way valve and a one-way valve. This invention's adjustable oxygen concentration hyperbaric oxygen chamber system can reduce the production cost of hyperbaric oxygen chamber systems, improve the user experience, and allow the oxygen concentration within the chamber to be adjusted below that of air, thus expanding its application to low-oxygen training and testing environments.

The invention belongs to the technical field of food fresh-keeping materials, and particularly relates to an aerogel type composite fresh-keeping pad as well as a preparation method and application thereof. The preparation method of the aerogel type composite fresh-keeping pad comprises the following steps: S1, mixing polyethylene glycol, oxalic acid and polyacrylic acid, and stirring at 70-80 DEG C to obtain a eutectic solvent; the method comprises the following steps: mixing a biomass raw material with a deep eutectic solvent, extracting, and filtering to obtain solid residues; s2, mixing the obtained solid residues with water, performing high-pressure homogenization treatment, mixing the obtained cellulose-containing suspension with a gelatin solution and a cross-linking agent, pouring the obtained mixed solution into a forming mold, performing freeze-drying treatment, and taking out to obtain the aerogel type composite fresh-keeping pad. The aerogel type composite fresh-keeping pad prepared by the method disclosed by the invention has good mechanical property, water absorption and antibacterial activity, and shows an excellent fresh-keeping effect in fresh-keeping of fish slices.

The utility model relates to the technical field of aquatic product transportation packaging boxes, and discloses a packaging box for fresh water crab transportation, which comprises a box body and a box cover, a placing plate is arranged in the box body, a mounting groove is formed in the top of the placing plate, a limiting assembly is arranged on the inner bottom wall of the mounting groove, and the limiting assembly comprises a supporting block and a limiting frame. Limiting frames are fixed to the two sides of the top of the supporting block, a groove is formed in the top of the supporting block, and a first sponge block is placed in the groove; according to the crab storage box, the structures such as the placement plate, the supporting blocks and the limiting frames are designed, so that the placed crabs can be limited, the crabs can be placed one by one, on one hand, the situation that the crabs are disordered in the box due to shaking during transportation can be avoided, and on the other hand, the storage box is convenient to use; on the other hand, the crabs can be prevented from colliding everywhere, so that the crabs can be prevented from being damaged, and the fresh rate of the crabs transported to the destination is increased.

This invention relates to the field of polymer compound technology, specifically to an antibacterial food-grade plastic product for sealing and preservation and its preparation method, comprising an outer support layer and an inner antibacterial layer. The outer support layer is prepared by melt blending raw materials such as PBAT, PLA, and modified nano-calcium carbonate, wherein the mass ratio of PBAT to PLA is 90-100:10-20. The inner antibacterial layer is composed of nano-chitosan, tea polyphenols, essential oil microcapsules, glycerol, and agarose, composited on the surface of the outer support layer. The essential oil microcapsules have a core-shell structure, loading plant essential oils onto mesoporous silica as a carrier, and are coated with calcium alginate on the outer layer. The antibacterial food-grade plastic product prepared by this invention possesses long-lasting antibacterial properties, excellent mechanical properties, and heat-sealing strength, and has broad application prospects in the food packaging field.

The application relates to the technical field of water treatment, and provides a water path control method, a water treatment system, a water treatment device and a storage medium, the method comprising the following steps: a control device detects whether a preset flushing trigger condition is met; if yes, a first-cup water flushing process is executed. The process at least comprises a first flushing sub-process and a second flushing sub-process executed in sequence. The first sub-process realizes backflow flushing and water replacement of a front filter assembly and other regions by controlling a first water inlet valve group, a first backflow valve group, a second backflow valve group and a wastewater valve group to be opened, while other related valve groups are closed and a pressure boosting assembly is started. The second sub-process forms a circulating water path to positively flush an RO filter assembly by controlling a second water inlet valve group, a circulating valve group and a wastewater valve group to be opened, while other related valve groups are closed and the pressure boosting assembly is started. The application realizes targeted and efficient flushing of multiple regions of the water treatment system by stage-by-stage and cooperative control of different valve groups, and effectively improves initial water quality.

This invention provides a method for preparing a seafood seasoning base and the method thereof. The preparation method includes: enzymatically hydrolyzing seafood raw materials to prepare an enzymatic hydrolysate; performing multi-stage isoelectric point separation of umami amino acids and umami peptides in the enzymatic hydrolysate to prepare seasoning base A and supernatant A; subjecting supernatant A to aroma-enhancing treatment to obtain seasoning base B; and mixing seasoning base A and seasoning base B to obtain the seafood seasoning base. First, the seafood raw materials are enzymatically hydrolyzed using a composite enzyme, which can increase the content of umami peptides and umami amino acids in the hydrolysate. Then, based on the difference in isoelectric points between umami peptides, glutamic acid, and aspartic acid and other types of amino acids and peptides, multi-stage isoelectric point separation of umami amino acids and umami peptides is performed in the enzymatic hydrolysate to separate umami amino acids and umami peptides from the enzymatic hydrolysate, thereby increasing the content of umami amino acids and umami peptides in the final seafood seasoning base and enhancing the umami flavor of the seafood seasoning base.

The invention relates to the technical field of rapeseed oil preparation, in particular to a processing method for strengthening the flavor of rapeseed oil, which comprises the following steps: acquiring the concentration of a key characteristic flavor substance, determining a rapeseed frying stage by combining the material temperature and the relative exhaust humidity, and determining a corresponding target threshold value; determining a heat uniformity index of a stir-frying process, determining stir-frying uniformity according to a corresponding target threshold value, and adjusting the rotating speed of a roller and heat radiation power; determining a flavor precursor maturity index and a thermal stress coefficient of the fried rapeseeds based on the thermal uniformity index, determining the uniformity of the frying process based on the thermal stress coefficient, and adjusting a spreading and airing target final temperature of the spreading and airing process; and obtaining the peroxide value of the finished product oil to determine the oil oxidation degree, determining the excess amount of the oxidation precursor generated in the stir-frying process based on the change trend of the peroxide value, and adjusting the target uniformity index and the target stir-frying temperature in the flavor outbreak period. By monitoring the process state in real time, frying, spreading, airing and smashing parameters are adjusted in a self-adaptive mode, and the characteristic flavor is enhanced.

Embodiments of the present disclosure disclose a kind of intersection generation method, device, electronic equipment and computer readable storage medium, the method comprises: obtaining the high-precision map data in the preset road range, wherein the high-precision map data includes high-precision boundary lane line;Obtain the standard-precision map data matched with the high-precision map data, wherein the standard-precision map data includes standard-precision intersection node and standard-precision road section line;In response to the intersection of the standard-precision road section line connected with the standard-precision intersection node and the high-precision boundary lane line, then according to the standard-precision map data, generate target intersection at the intersection point of high-precision boundary lane line.This technical solution can accurately, timely and efficiently generate low-grade road intersection, so as to improve the freshness and completeness of high-precision map data, to assist the automatic driving car to accurately enter or exit corresponding intersection area, improve the user's use experience.

This invention belongs to the field of high-value utilization and processing of waste wood fiber raw material, coffee grounds, and discloses a method for preparing a coffee grounds regenerated membrane and its application. The method for preparing the coffee grounds regenerated membrane of this invention includes the following steps: degreasing and drying the coffee grounds; dissolving the degreased coffee grounds; casting the coffee grounds solution into a mold and cooling it; placing the coffee grounds sol in a metal ion solution for coagulation and regeneration; and hot-pressing and drying the coffee grounds regenerated gel to obtain the coffee grounds regenerated membrane. This invention uses a metal ion solution as the regeneration coagulation bath. The strong metal coordination bonds formed between the metal ions and the oxygen-containing functional groups of the coffee grounds molecules, along with the antibacterial properties of the metal ions themselves, endow the coffee grounds regenerated membrane with excellent physical and antibacterial properties.

The utility model provides a positioning device for portal vein high pressure interventional radiotherapy, which comprises a treatment bed, a lower support frame and a head and neck support assembly, and a bed plate is arranged at the upper end of the internal composition of the treatment bed. A head and neck supporting assembly is fixed through connection of an upper connecting plate and a lower connecting plate, the neck of a to-be-treated person is supported by a neck supporting seat, the material of the neck supporting seat can be selected according to the to-be-treated person, and an adjusting sliding block slides in an adjusting sliding groove to adjust two groups of head fixing seats to proper positions to be clamped on the two sides of the head; according to the adaptive posture, a medical worker enables an adjusting stud to rotate in an adjusting threaded hole, the head fixing base and the neck supporting base are adjusted to be at the proper height position, the positioning comfort can be improved, and the head refreshing degree of the to-be-treated person can be improved by additionally arranging the head and neck supporting assembly.

This invention provides a rotatable suspended magnetic levitation structure, relating to the field of monorail transit technology, including a track beam; a suspension frame assembly that cooperates with the track beam, with a portion of the suspension frame assembly located on the ground-facing side of the track beam, and the suspension frame assembly adapted to move along the extension direction of the track beam; and a carriage connected to the suspension frame assembly, which is adapted to drive the carriage to rotate horizontally. The suspension frame assembly of this invention can drive the carriage to move along the extension direction of the track beam while simultaneously driving the carriage to rotate horizontally, allowing passengers to enjoy panoramic views of the surrounding scenery during their journey. Whether it's cityscapes, natural landscapes, or specific themed scenes, the views are presented to passengers from different angles, increasing the enjoyment and novelty of the ride.

The invention discloses low-temperature fresh-keeping equipment, a low-temperature fresh-keeping method and a computer readable storage medium, and belongs to the technical field of fresh-keeping equipment. The low-temperature fresh-keeping equipment comprises a fresh-keeping container, a refrigeration assembly, an air exhaust assembly and an exhaust assembly, the fresh-keeping container is provided with a containing cavity, the refrigeration assembly is provided with a low-temperature storage chamber, the air exhaust assembly is communicated with the fresh-keeping container, the exhaust assembly is communicated with the fresh-keeping container, and the low-temperature fresh-keeping equipment has a first state and a second state. In the first state, the exhaust assembly is opened, and the air exhaust assembly drives airflow to circulate between the containing cavity and the low-temperature storage chamber. In the second state, the exhaust assembly is closed, and the air exhaust assembly controls negative pressure to be formed in the containing cavity. According to the low-temperature fresh-keeping equipment, heat conduction of the fresh-keeping container can be accelerated, so that the fresh-keeping effect of the low-temperature fresh-keeping equipment is improved.

This utility model discloses a preservation and storage device for purple sweet potato custard mooncake filling, including a refrigeration cabinet. Several storage boxes are arranged inside the refrigeration cabinet. A fixed frame is fixedly connected to the top of each storage box. Limiting plates are provided on both the left and right sides of the fixed frame. A cover plate is provided on the top of the fixed frame. Two second hinges are provided on the rear side of the cover plate. The cover plate is movably connected to the top of the fixed frame via the second hinges. Handle grooves are provided on both the cover plate and the fixed frame. A baffle is provided on the top of the cover plate, and the baffle is movably connected to the top of the adjacent limiting plate. The bottom of the baffle movably passes through the two handle grooves. This utility model's preservation and storage device for purple sweet potato custard mooncake filling not only limits the movement trajectory of the storage boxes but also presses and fixes the cover plate, thereby sealing the storage boxes, preventing odor transfer, and achieving good preservation, thus preventing the filling from spoiling.

The utility model relates to the technical field of cleaning cabinet, and disclose a good protection effect's sterilization cleaning cabinet, the inside installation of main part assembly has the composite protection component, the inside installation of composite protection component has detachable easy cleaning tray component, and the outside installation of main part assembly has the totally enclosed sealing door component, the utility model discloses a composite protection component can pass through ultraviolet ray sterilization and plasma antibacterial double effect can efficiently kill the bacteria, virus and other microorganism of the surface of article in the box, restrain the bacteria breeding simultaneously, reach good fresh -keeping effect, drying -out box heating device can produce heat fast and realize the efficient drying of article to prevent the article breeding bacteria under the humid environment, guarantee article dry and clean, prolong the life, through the installation detachable easy cleaning tray component, can promote user use convenience and cleaning efficiency, can easily dismantle and carry out deep cleaning, keep the clean and sanitary of sterilization cleaning cabinet inside, guarantee user use safety.

This invention relates to the field of food antibacterial and preservative technology, specifically to a plant lactobacillus 9, a compound preservative containing plant lactobacillus 9, and their applications. The plant lactobacillus 9 is produced from *Lactobacillus plantarum* with the preservation number CCTCC NO: M 2026808. Lactobacillus plantarum The amino acid sequence of this plant lactobacillus 9 is N-Thr-Asp-Gly-Ala-Ala-Phe-OH. This plant lactobacillus 9 exhibits strong antibacterial activity against Listeria monocytogenes, Bacillus subtilis, Micrococcus luteus, methicillin-resistant Staphylococcus aureus, Escherichia coli, Pseudomonas fluorescens, Salmonella typhimurium, and Pseudomonas aeruginosa, and demonstrates outstanding stability. It is a safe and reliable biological preservative. Its effectiveness is significantly enhanced when combined with chitosan, making it a potential alternative to chemical preservatives for controlling foodborne pathogens in the agricultural and food industries and extending the shelf life of meat and meat products.

The utility model belongs to cold chain preservation technology field especially is a kind of fresh-keeping device for cold chain distribution, including heat preservation box, and the left and right positions between the upper and lower and rear side inner wall of heat preservation box are fixedly installed with two baffle, and left and right two sides baffle will heat preservation box be sequentially separated into first installation chamber, placing chamber and second installation chamber from left to right, and blowing mechanism is arranged in first installation chamber and second installation chamber, and blowing mechanism includes controller, battery, fan, air vent and activated carbon adsorption plate, and placing mechanism is fixedly installed in the upper and lower positions between baffle, and upper and lower placing mechanism will placing chamber be sequentially separated into three placing cavities from top to bottom, the utility model discloses blowing mechanism makes cold air distribution even, and preservation effect is better, avoid article frostbite, increase peculiar smell adsorption function simultaneously, it is convenient to store and take the article on placing mechanism, improve work efficiency, reduce cold air loss, it is favorable to use.

The invention provides a bio-based fresh-keeping film and a preparation method thereof, and belongs to the technical field of fruit and vegetable fresh-keeping, the preparation method of the bio-based fresh-keeping film provided by the invention comprises the following steps: S1, weighing green tea leaves, and treating the green tea leaves with an extraction solvent to obtain a green tea extract; s2, mixing a green tea extract, deionized water, water-soluble chitosan and glycerol, uniformly stirring, homogenizing the solution, and degassing the solution after the homogenization to obtain a film forming solution; and S3, transferring the film forming liquid into a mold, drying to form a film, and then carrying out ultraviolet radiation treatment on the film to obtain the bio-based fresh-keeping film. The bio-based fresh-keeping film prepared by adopting the method has relatively high mechanical strength and relatively good fresh-keeping performance, not only is favorable for improving the fresh-keeping effect of fresh fruits and reducing the postharvest loss, but also provides a new technical approach for promoting the innovation of green packaging materials and the sustainable development of the fresh fruit industry.

The invention relates to the technical field of Internet of Things wireless communication, in particular to an information age minimization method and device for an opportunistic channel access system, the system comprises a base station and N Internet of Things devices, and the method comprises the following steps: each active device competes for a channel access right in a discrete time slot with a competition probability p; the winning device evaluates the channel gain and calculates the unloading rate, and decides whether to access according to the comparison with an unloading rate threshold r; the accessed equipment unloads data to the base station; the base station calculates the average information age in the observation period; and p and r optimized by a hierarchical iteration solving algorithm are fed back to each piece of Internet of Things equipment. Through joint optimization of two parameters and combination of an opportunity channel access mechanism, the defects that information freshness is insufficient and a non-convex problem is difficult to solve are overcome, the channel utilization efficiency is improved, and the method is suitable for a multi-device real-time data transmission scene.

This invention discloses an air conditioner, including a casing, an air handling module, a drive device, and a mounting plate. The casing has a first air outlet. The air handling module includes a module housing, an air handling component, and a lifting device. The module housing has a processing air duct and a guide space, which communicates with the first air outlet. The processing air duct has a connecting hole. The air handling component is located within the processing air duct. The lifting device is movably mounted on the module housing to open or close the connecting hole. The drive device includes a moving component and a drive motor. The drive motor is connected to the moving component, and the moving component drives the lifting device to move. The drive motor is located on the rear surface of the mounting base. The mounting plate is located on the rear side of the module housing and has a through hole. The mounting base is mounted on the front side of the mounting plate, and the drive motor passes through the through hole. The air conditioner of this embodiment improves structural stability by providing a through hole on the mounting plate to avoid and fix the drive motor.

This utility model discloses a breathable and pressure-resistant fruit and vegetable packaging box, relating to the field of packaging box technology. It includes a packaging box body with reinforcing frames on all four inner walls. Multiple sets of horizontal and vertical reinforcing ribs are installed on the inner walls of the reinforcing frames. Sliding grooves are formed at the top of both inner walls of the packaging box body, with a lid slidably connected to adjacent grooves. Multiple sets of ventilation holes are formed on the lid. Two sets of limiting components for the lid are provided on the front face of the packaging box body. Each limiting component includes a telescopic connecting rod movably connected to the outer front wall of the packaging box body, with a rotating pressure plate installed at the other end of the telescopic connecting rod. The reinforcing frames, horizontal and vertical reinforcing ribs of this application improve the overall strength and pressure resistance of the fruit and vegetable packaging box, preventing damage to fruits and vegetables during transportation and ensuring normal ventilation, thus improving freshness. The rotating pressure plate of the limiting components is rotatable, and the lid can be easily removed from the adjacent grooves, facilitating the retrieval of fruits and vegetables from the packaging box.

This application belongs to the field of livestock breeding technology, specifically relating to a biosafety housing. The biosafety housing includes a gas filtration zone for connecting to and filtering external gases; a breeding zone for raising animals; a ceiling zone located at the top of the breeding zone and connected to both the breeding zone and the gas filtration zone; a positive pressure ventilation system located at the connection between the gas filtration zone and the ceiling zone to create positive pressure, allowing the gas filtered in the gas filtration zone to enter the breeding zone through the ceiling zone; and a negative pressure ventilation system located at the exhaust outlet of the breeding zone to create negative pressure, discharging the gases from the breeding zone to the outside. This application, through the coordination of the gas filtration zone, breeding zone, ceiling zone, positive pressure ventilation system, and negative pressure ventilation system, creates a micro-positive pressure environment, significantly improving the air exchange effect between the inside and outside of the breeding zone without altering the original building structure, resulting in significantly improved air freshness and a more suitable temperature within the breeding zone.

The present application relates to the technical field of fresh-keeping packaging, and specifically provides a packaging method and system for fresh-keeping storage, which comprises the following steps: obtaining the number of bacteria on the surface of the to-be-packaged article, determining whether to perform ultraviolet sterilization; when performing micro-freezing treatment, placing the to-be-packaged article into ice water, adding salt into the ice water according to the amount of ice water; the refrigerator performs refrigeration at an initial power, obtaining the real-time temperature of the to-be-packaged article, and determining whether to adjust the initial power; obtaining the bacterial content in the ice water, and determining whether to start the water changing device; segmenting the to-be-packaged article; collecting the volume after segmentation, completing the vacuumizing operation at the air extraction rate S0 and performing sealing; collecting image data, obtaining the bubble volume V0 in the to-be-packaged article after sealing, and determining whether the packaging is qualified. The method combines ultraviolet sterilization, micro-freezing treatment and vacuum sealing to realize the safety, freshness and quality of the to-be-packaged article during long-term storage, and improves the utilization efficiency of resources.

The invention discloses a complex intersection map making method of a multi-sensor fusion scheme, and belongs to the technical field of intelligent driving, and the method comprises the following steps: preprocessing single-trip data to generate a speedometer track, and aligning the speedometer track with a GPS positioning track to obtain a single-trip track; screening point cloud frame pairs of which the central point distances are smaller than a preset distance threshold value from different single-trip tracks to form a potential point cloud matching pair set of cross-trip matching; performing two-stage registration on each point cloud frame pair in the set based on a registration network and an algorithm, and solving a relative pose of each point cloud frame; constructing a graph model based on the relative poses of all the point cloud frames, and introducing the same-trip speedometer trajectory constraint and the cross-trip relative pose constraint to carry out joint optimization; and fusing the point clouds based on the optimized poses and generating an intersection point cloud map. According to the invention, high-precision, strong-robustness, automatic and low-cost complex intersection point cloud map construction can be realized, and the method is suitable for application scenes with high requirements on map freshness and precision, such as intelligent traffic and automatic driving.

This invention discloses a denitrification process for preparing sweet white wine. The process steps are as follows: Grape pretreatment: Select fresh white grapes of uniform ripeness, manually remove rotten and diseased grapes, destem, crush, and extract juice using a press. Collect the juice and filter to remove pomace to obtain initial grape juice; Juice clarification: Quickly cool the initial grape juice to 3-5°C, add 30-35 mg / L pectinase and 40-60 mg / L sulfur dioxide, stir evenly, and let it stand for clarification for 24-36 hours. Take the supernatant as the fermentation liquid; Primary denitrification fermentation: Transfer the fermentation liquid to a fermentation tank, raise the temperature to 12-15°C, inoculate with wine yeast, control the fermentation temperature at 16-18°C, and stir 2-3 times a day; When the alcohol content of the fermentation liquid reaches 3.5% vol, add 0.4-0.5 g / L of chitosan-benzene complex. This invention's staged denitrification avoids the yeast stress response caused by adding a large amount of adsorbent at once, and significantly enhances the microbial stability of the wine.