30results about How to "Good lifting effect" patented technology

The invention discloses a method for optimizing key structure parameters of a deep well electric submersible pump based on performance simulation, and relates to the technical field of design optimization of electric submersible pumps, a three-dimensional geometric model of a deep well submersible centrifugal pump is built in advance, the three-dimensional geometric model comprises an impeller, a guide shell, a pump shaft, a pump shell, an upper connector, a lower connector and a full-flow-channel structure, and initial structure parameters are calibrated; and establishing a centrifugal pump simulation model based on a computational fluid dynamics technology, performing fluid domain extraction, grid division and grid independence verification on the three-dimensional geometric model, and setting fluid attributes, boundary conditions and a turbulence model. According to the method, a closed-loop iteration framework for simulation, optimization, evaluation and feedback is constructed by adopting a mode of coupling a computational fluid dynamics simulation technology and a genetic algorithm, the limitation of local parameter optimization in the prior art is broken through, systematic and collaborative optimization of key structure parameters of the submersible centrifugal pump is realized, and the method is suitable for large-scale popularization and application. And the efficiency of the optimization process and the final optimization effect are obviously improved.

This utility model relates to the field of cosmetic medicine and discloses a suture for facial lifting, comprising: a suture body, wherein the suture body is provided with forward barbs and reverse barbs, a limiting head is slidably sleeved on the suture body, the reverse barbs are engaged with the limiting head, an elastic sheet is provided inside the limiting head, and the limiting head is engaged with the reverse barbs through the elastic sheet, wherein there are multiple reverse barbs, and the multiple reverse barbs are equally spaced. This utility model has the following advantages and effects: both the forward and reverse barbs have a lifting effect on human tissue, good stability, improved lifting effect on human tissue, effectively improved cosmetic effect, and convenient fixation of the end of the suture body, which can be achieved by simply cutting off the excess suture below the limiting head.

This application provides a method for preparing gallium oxide (GaO) with enhanced ultraviolet absorbance and a GaO material prepared according to this method. First, a GaO thin film capable of generating ultraviolet absorption is grown on a substrate by magnetron sputtering. The GaO thin film is then annealed. Next, a copper thin film is grown on the GaO thin film by magnetron sputtering, followed by rapid annealing, causing the copper film to crack into copper nanoparticles under heat. This preparation method utilizes copper nanoparticles to enhance the ultraviolet absorption performance of GaO. The process steps are simple and easy to operate, thus effectively reducing the preparation cost. Furthermore, the GaO material prepared by this method shows a significant improvement in ultraviolet absorbance.

The embodiment of the invention provides a display panel and a display device, relates to the technical field of display, and aims to solve the problem of non-uniform display of the display panel. The display panel is provided with a fan-out area; the fan-out area comprises a first area and second areas located on the two opposite sides of the first area. The first area and the second area are arranged in the first direction; the display panel comprises a plurality of fan-out lines; the plurality of fan-out lines comprise a plurality of first-type fan-out lines and a plurality of second-type fan-out lines; the plurality of first-type fan-out lines are located in the first area, and the plurality of second-type fan-out lines are located in the second area; each first-type fan-out line in the plurality of first-type fan-out lines comprises a first winding part, and the size of the area occupied by the first winding part in the second direction is smaller than the line length of the first winding part; every two adjacent first fan-out lines in the first direction are arranged on different layers. In the thickness direction of the display panel, orthographic projections of the first winding parts of every two adjacent first fan-out lines on the plane where the display panel is located are at least partially overlapped.

The invention belongs to the technical field of microorganisms, and particularly relates to lactobacillus rhamnosus FMBL L25209 MQ with the effects of resisting oxidation and prolonging the service life, the lactobacillus rhamnosus FMBL L25209 MQ is preserved in the China Center for Type Culture Collection on September 18, 2025, the preservation number is CCTCC M 20252059, and the lactobacillus rhamnosus FMBL L25209 MQ can utilize oligosaccharides such as galactooligosaccharides, soybean oligosaccharides and maltooligosaccharides; good tolerance to acid and cholate is achieved; the compound has the effects of inhibiting bacteria, resisting oxidation, prolonging the service life, resisting aging and the like, can be used for preparing medicines for resisting oxidation, resisting aging and prolonging the service life, and has a wide application prospect.

The utility model discloses a paperboard lifting mechanism for paperboard printing, which comprises a bottom plate, and the top of the bottom plate is fixedly connected with a driving box. When the motor is adopted to drive the first threaded rod to rotate, the movable frame stably ascends or descends in the threaded direction, the supporting column moves up and down, and therefore the bearing plate is driven to achieve position adjustment in the vertical direction. By means of the structural design, the paperboard is evenly stressed in the lifting process, inclination or shaking is avoided, and the stability of the paperboard is guaranteed. When the electric cylinder pushes the sliding block to slide in the sliding groove, the connecting rod drives the bearing plate to rotate around the hinge point, the inclination angle of the bearing plate can be adjusted according to needs, paperboards can be smoothly conveyed to the surface of a conveyor, the paperboard conveying convenience and efficiency are improved, the paperboard printing efficiency is indirectly improved, and the whole lifting mechanism is compact in structure, small in occupied space and convenient to use. The device is convenient to install and maintain, is suitable for various paperboard printing production lines, and has the advantage of being good in lifting effect.

A micro-arc oxidation treatment method for a magnesium alloy containing an LPSO phase, which adopts an electrolyte system mixed with three kinds of salts, i.e., a metallate, a silicate and a phosphate, and combines two-step micro-arc oxidation treatment to control the generation of ceramic phases in the oxide film layer structure and embed a large number of exposed LPSO phases in the micro-arc oxidation film, so that the obtained micro-arc oxidation film has small porosity and pore size, a smooth surface and no micro-cracks, the porosity is less than or equal to 9%, the micro-arc oxidation film has a pore size of 140-1100 nm and an average pore size of less than or equal to 1 micrometer, and the corrosion resistance of the magnesium alloy is significantly improved, the self-corrosion current density of the magnesium alloy is reduced by three orders of magnitude compared with that before the micro-arc oxidation treatment, the self-corrosion current density is less than or equal to 3.588*10 ‑8 A cm ‑2 , and the corrosion resistance efficiency is greater than or equal to 1208%.

This invention relates to a protective slag for sulfur-containing free-cutting steel crystallizers using photovoltaic silicon mud and its preparation method. The protective slag of this invention contains, by mass percentage, 30.6–31.6 wt% CaO, 36.7–37.7 wt% SiO2, 6.1–7.1 wt% Al2O3, 8.2–9.2 wt% Na2O, 5.0–6.0 wt% F, and 9.0–10.0 wt% C. 固 H2O up to 0.5 wt%; C 固 The carbon in the protective slag is fixed. Raw materials include 7-9 wt% silica mud, 14-16 wt% blast furnace slag, 24-26 wt% phosphorus slag, 14-16 wt% silicate cement, 4-6 wt% wollastonite, 10-12 wt% soda ash, 2-4 wt% fluorite, 6-8 wt% cryolite, and 10-12 wt% carbon powder. The preparation method includes batching, slurry preparation (solid content 40-45%), spray granulation (spray gun orifice diameter 1.0-1.5 mm, inlet temperature 450-480℃), and post-treatment. This invention enables the utilization of photovoltaic silica mud, reducing the cost of protective slag containing silica mud by 870 yuan per ton, and increasing the flaw detection pass rate of continuously cast billets from 25.99% to 55.17%, thus possessing both energy-saving and emission-reduction value and a circular economy value.

The utility model discloses a hydraulic crane which comprises an advancing hoisting mechanism, double hydraulic hoisting assemblies, a lifting protection assembly and a fixing assembly, the double hydraulic hoisting assemblies are arranged on the two sides of the advancing hoisting mechanism, and the lifting protection assembly is arranged on the outer side of the double hydraulic hoisting assemblies. The fixing assembly is arranged in the center of the outer side of the dual-hydraulic lifting assembly, and the dual-hydraulic lifting assembly comprises a mounting base, a positioning cross rod, a first hydraulic cylinder body, a clamping groove, a first fixing block, a limiting sliding sleeve and a second fixing block. The hydraulic crane provided by the utility model has the advantages of multiple protection and good hoisting effect, and solves the problems that hoisting accidents are possibly caused when any hydraulic cylinder of the hydraulic crane is damaged when the hydraulic crane in the prior art is used, and the existing hydraulic crane does not have a multiple protection limiting function, so that the hoisting accidents are caused. And the hoisting risk exists in the using process of the hoisting device.

The utility model provides a kind of split type spliced handlebar and luggage, it is related to the technical field of daily necessities, the split type spliced handlebar includes handlebar assembly and sleeve, the quantity of handlebar assembly is set to two, handlebar assembly is provided with plug-in rod, two plug-in rod are oppositely arranged and end detachably connected to form support rod, the sleeve is sleeved on the support rod;The luggage includes the split type spliced handlebar;Two handlebar assembly and sleeve of the utility model cooperate with each other, not only can carry larger load, the lifting effect is remarkable, and can be selected according to the actual demand of user The sleeve of corresponding appearance is installed, appearance is various and exquisite, simultaneously when handlebar is damaged, the replacement of single component can be realized, structure is flexible, and use cost is low.

The utility model discloses a one-piece shapewear which comprises a chest binding area, a waist binding area, a crotch area and a back area, the chest binding area, the waist binding area, the crotch area and the back area are connected together according to the structural characteristics of a human body, switch belts are arranged on the two outer sides of the back area, secondary tightening threads are arranged on the inner sides of the switch belts, and the secondary tightening threads are connected with the switch belts. A main compact line is arranged at the central position of the back area; the back area is further provided with a hip lifting area, and a hip lifting line is arranged on the outer edge of the hip lifting area. The body-shaping underwear is good in body-shaping effect, high in air permeability, convenient to put on and take off and capable of better meeting the requirements of consumers.

The utility model discloses a facial soft tissue fascia lifting belt, which relates to the technical field of facial soft tissue lifting, and comprises a breathable belt body and ear holes, the left end and the right end of the breathable belt body are respectively and integrally connected with a first bandage and a second bandage, and the outer side surface of the second bandage is provided with a hook-and-loop fastener thorn surface. The bottom end of the breathable belt body is integrally connected with a jaw lifting pad, a mouth hole is formed in the jaw lifting pad, reinforcing belts are fixed to the left side face and the right side face of the breathable belt body, fixing pastes are arranged above the reinforcing belts, and ear holes are formed in the first binding belt and the second binding belt. An elastic rope is arranged above the fixing patch, earrings are fixed to the outer end of the elastic rope, and a first elastic belt and a second elastic belt are fixed to the left side and the right side of the rear side face of the breathable belt body respectively. According to the face soft tissue fascia lifting belt, pain is relieved through a replacement fixing mode, blood non-circulation is avoided, and the lifting effect is improved.

The invention discloses a light-emitting element, and the element comprises an LED chip which is provided with a first surface, a second surface opposite to the first surface, and a side wall connected with the first surface and the second surface. The wavelength conversion layer is at least arranged on the first surface of the LED chip; the electrode expansion structure is arranged on the second surface of the LED chip; the packaging layer at least surrounds the LED chip, the wavelength conversion layer and the electrode expansion structure; and at least one functional structure module selected from the group consisting of the following structure modules. The method can flexibly adapt to different application scenes.

This invention relates to the field of battery technology, and in particular to a modified negative electrode, a full cell, and a preparation method thereof. The modified negative electrode includes a negative electrode and a ceramic layer coated on the surface of the negative electrode; the ceramic layer includes a fast ion conductor, ceramic particles, and a binder. The ceramic layer of this invention employs a composition of a fast ion conductor, hollow ceramic particles, and a binder. The hollow ceramic particles provide mechanical strength and buffer space, the fast ion conductor provides an ultrafast lithium-ion transport channel, and the composite ceramic layer, incorporating the fast ion conductor and ceramic particles, provides the core requirements for stable mechanical support, stress buffering, and ion conduction at the silicon-doped negative electrode interface. This significantly improves the effectiveness of reducing interface wrinkles on the negative electrode sheet after formation, maintaining the integrity of the electrode structure between the coating and the current collector, and the active material particles.

The invention discloses a preparation method for constructing a multistage micro-nano heterostructure based on combination of a laser melting deposition process and a laser shock peening means, which comprises the following steps of: printing by using dry TC4 alloy powder, accumulating a printed TC4 metal printing layer to form a TC4 metal micron layer, performing low-power laser shock peening on part of the TC4 metal micron layer to form a TC4 metal submicron layer, and forming the multistage micro-nano heterostructure. A TC4 metal printing layer is printed on the submicron layer and subjected to high-power laser shock peening to form a TC4 metal nano layer, a TC4 metal printing layer is printed on the nano layer and subjected to low-power laser shock peening to form a TC4 metal submicron layer, printing and cyclic operation are continued on the submicron layer to form a sample, and the sample is obtained through annealing treatment. According to the preparation method disclosed by the invention, a micron layer-nano sandwich composite layer-micron layer multi-stage micro-nano heterostructure is formed, crack propagation is effectively hindered, and the elongation of the material is improved, so that alloy strength and plasticity synergistic strengthening is realized.

A short-range clutter suppression method for reducing the number of orthogonal waveforms used, comprising: determining the range of short-range clutter to be suppressed; determining the number of short-range clutter ambiguities M; determining the number of orthogonal waveforms to be used and the corresponding orthogonal waveforms; determining the ambiguity region in which the main clutter region is located; determining the timing of the radar transmitting the orthogonal waveforms and transmitting the orthogonal waveforms; and performing matched filtering on the echo according to the order of the transmitted orthogonal waveforms to obtain the main clutter region signal with short-range ambiguous clutter suppressed. Compared with existing range ambiguity suppression methods, the present application can improve the suppression capability of short-range clutter, and is suitable for cases where there are multiple short-range ambiguities and the main clutter region is outside the multiple ambiguity regions in the short-range region. Especially for cases where the pulse repetition frequency is high, resulting in a large number of observable region ambiguities, the number of orthogonal waveforms is reduced, and the improvement is more obvious.

The application relates to a preparation method of a polyamide composite nanofiltration membrane containing a graphdiyne intermediate layer and application thereof, and belongs to the field of membrane separation and technology. The polyamide composite nanofiltration membrane contains a porous substrate, a graphdiyne intermediate layer and a polyamide layer. The graphdiyne is selected from graphyne, graphdiyne, hydrogen-substituted graphdiyne and other graphdiyne derivatives. The specific preparation method is as follows: a graphdiyne dispersion liquid is suction-filtered onto a porous substrate, is respectively immersed in an aqueous phase and an oil phase, interfacial polymerization is carried out to generate a polyamide membrane, finally, the membrane is dried in a constant-temperature and constant-humidity oven, and a polyamide composite nanofiltration membrane containing a graphdiyne intermediate layer is obtained. The preparation method is simple and efficient, the prepared composite membrane can effectively intercept divalent salts and organic matters in water, and has excellent water permeability, ion separation and antibiotic desalination effect.

This invention belongs to the field of *Coptis chinensis* cultivation technology, specifically relating to a cultivation method for increasing the berberine content in *Coptis chinensis*, comprising the following steps: seedling cultivation, transplanting, microbial inoculation, light management, fertilization management, staged drought stress induction, water management, and harvesting; the microbial inoculation involves simultaneously applying a compound microbial agent containing *Bacillus amyloliquefaciens*, arbuscular mycorrhizal fungi, and plant rhizosphere growth-promoting bacteria at the time of transplanting; the light management involves shading combined with LED supplemental lighting; the staged drought stress induction involves controlling the relative soil moisture content to 45%-55% for 7-10 days after transplanting, 60-75 days after transplanting. This invention, through the synergistic effect of microbial inoculation, light quality regulation, and drought stress induction, can significantly increase the berberine content in the roots of *Coptis chinensis* by more than 120% compared to conventional cultivation methods, and is standardized, green, and sustainable, suitable for large-scale cultivation and promotion.

This invention provides a triboelectric nanogenerator and its fabrication method. The generator operates in a vertical contact-separation mode, with a positive friction layer of PET film and a negative friction layer of PDMS composite film with a single layer of dense SiO₂ microspheres inserted on its surface. The fabrication process employs a two-step spin-coating method: first, a PDMS solution is spin-coated onto a substrate; then, a suspension of SiO₂ microspheres is spin-coated onto the uncured surface. After heating and curing, a composite negative friction layer is formed, which is then assembled with electrodes and a support structure. This invention significantly increases the triboelectric contact area and enhances charge trapping capability by constructing the SiO₂ microsphere insertion layer, thereby greatly improving output performance. Furthermore, the fabrication process is simple and low-cost, making it suitable for powering microelectronic devices and self-powered sensing applications.

The application discloses a kind of space-time adaptive processing methods of airborne broadband radar based on frequency domain compensation, comprising: obtaining target echo signal;The distance sampling is carried out to broadband echo signal, and the sampled target echo signal is obtained;The Fourier transform is carried out to the sampled target echo signal, and the target echo signal in distance frequency domain is obtained;The target echo signal after matching filtering is obtained by carrying out matching filtering processing to the target echo signal in distance frequency domain;According to the preset phase compensation factor, the envelope movement between each array element and each pulse of the target echo signal after matching filtering is compensated, and the compensated target echo signal is obtained;The inverse Fourier transform is carried out to the compensated target echo signal, and the target echo signal in distance time domain is obtained;The echo signal in distance time domain is carried out space-time adaptive processing, and clutter and noise are inhibited.The application can improve effect more obvious.

The present application provides a compound for a cover layer represented by the following Chemical Formula 1 and an organic light emitting element comprising the same: <Chemical Formula 1>

The utility model relates to the technical field of rehabilitation exercise equipment, and discloses a double-hook type acetabulum drag hook with a deformation handle, which comprises a handle end, a hook neck is arranged on the handle end, an angle block is arranged on the hook neck, and hook heads are arranged on the hook neck and the angle block; a distance adjusting rod connected with the angle block is vertically arranged on the hook neck, and the distance adjusting rod rotates to push the angle block to move horizontally in the width direction of the handle end to form a double-hook distance adjusting structure. The acetabulum drag hook structure with the adjustable hook distance is formed by adopting a double-hook mode, the distance between the double hooks is adjusted according to the hip structure, the contact range of hook heads is expanded, discomfort of a patient during lifting is relieved, the angle of the handle end is adjusted according to the hip shape and the lifting direction in cooperation with the deformable handle end, and the acetabulum drag hook structure with the adjustable hook distance is obtained. The cross handle can be formed through combination according to actual conditions, so that the purpose of facilitating force application is achieved, the angle limitation in the lifting process is reduced, and the lifting effect is enhanced.

This invention belongs to, but is not limited to, the field of intelligent accounting archive technology, and discloses an intelligent archiving method for accounting archives and a data verification and rollback control method. The method includes: dynamic QR code technology + barcode scanner / PDA + NLP image type recognition + RFID archive borrowing to achieve intelligent archiving; when a document is saved, a QR code is generated based on the relevant information of the document, and the corresponding metadata information is updated at different business nodes; sub-codes and master codes are used to verify data uniqueness; a communication protocol with the barcode scanner / PDA ensures data security; NLP identifies image types, and different types of attachments are verified in different ways; RFID facilitates quick retrieval when borrowing archives. This invention not only effectively improves the management efficiency of enterprises, but also brings positive impacts on energy conservation, environmental protection, and sustainable development. Through optimization of each link, by reducing paper and energy consumption, improving resource utilization efficiency, and enhancing the enterprise's risk resistance, a win-win situation of economic and environmental benefits is ultimately achieved.

This invention proposes a student book recommendation system and method based on an improved temporal graph neural network, comprising a student borrowing graph representation model generation module, a graph node embedding matrix generation module, a graph-level embedding vector generation module, a book borrowing relationship prediction matrix generation module, and a borrowing relationship decoding and reconstruction module. It is implemented through five processes: determining the student book borrowing graph representation model, obtaining graph-level embedding vectors, obtaining a book borrowing relationship prediction matrix based on an improved gated recurrent unit model, and obtaining the borrowing relationships after decoding and reconstructing the prediction matrix. This invention considers the changes in students' borrowing interests over time, thus influencing their borrowing behavior and preferences. Compared to the previous recommendation algorithm, this invention reduces computation time by 50% and doubles efficiency.

This invention discloses a method for identifying damage to aircraft smart skin based on complex modal expansion and Kalman filtering. The steps include: acquiring strain values ​​at the location of fiber optic strain sensors; constructing a finite element model of the aircraft smart skin and extracting modal features; constructing a complex modal expansion equation; solving for the full-field strain value of the aircraft smart skin based on the complex modal expansion equation; and obtaining the damage identification result of the aircraft smart skin. This invention uses a finite element model obtained by discretizing a proportional 3D model of the aircraft smart skin to solve for the full-field strain value. It employs a finite fiber optic strain sensor to expand the full-field strain in real time and performs damage identification based on the full-field strain. The finite element model has a simple structure and does not require iterative optimization, effectively improving identification efficiency and robustness while ensuring identification accuracy.

The application discloses a liquid storage and bypass air conditioning system and a control method. The air conditioning system comprises a compressor, a four-way reversing valve, an outdoor heat exchanger, an electronic expansion valve, a gas-liquid separator integrated with a high-pressure liquid storage device, an indoor heat exchanger and nine electromagnetic valves. When the air conditioning system operates in different modes or different working conditions, the optimal refrigerant charging amount required by the system is different, and the system performance seriously deteriorates in extreme working conditions. The liquid storage and bypass air conditioning system and the control method can independently adjust and control the refrigerant circulation amount when the system operates in different working conditions of the cooling and heating dual modes, ensure that the circulation amount in each mode and each working condition is relatively optimal, and reduce the area of the internal heat transfer deterioration region of the evaporator through the gas bypass technology, improve the heat exchange performance of the evaporator side, and comprehensively make the air conditioning system performance not attenuate and even improve in the variable mode and variable working condition, especially the improvement in the high-temperature refrigeration working condition is more obvious.

The utility model belongs to the technical field of packaging machines, and particularly relates to a packaging machine discharging device which comprises lifting plates symmetrically and rotatably installed in a material box, a sliding groove is formed in one side of each lifting plate, a through groove is formed in the bottom of each sliding groove in a penetrating mode, annular plates matched with the lifting plates in number are rotatably arranged on the inner side wall of the material box, and the annular plates are arranged on the inner side wall of the material box. The side walls of the annular plates are fixedly connected with supporting rods, one ends of the supporting rods are rotationally connected with rollers, the rollers are used for being in sliding fit with the sliding grooves, the two annular plates are arranged diagonally, and the two supporting rods are arranged in a mirror image mode. The two lifting plates are driven by rotation of the annular plate to synchronously reciprocate, movement is regular, stress is uniform, passive material vibration in an original patent is converted into active material lifting, influences of external factors such as raw material flow, granularity, weight and falling height are avoided, and the lifting effect and stability are better.

The invention provides a dual-mode self-adaptive control method for an ultrafiltration system, and relates to the technical field of water treatment.The dual-mode self-adaptive control method comprises the steps that a working mode with water production priority or maintenance priority is set; executing and collecting the water yield Q and the water production power consumption E per ton in the current operation cycle; determining an evaluation level of the current control parameter according to an evaluation rule corresponding to the current working mode; and keeping or adjusting the control parameters of the next operation cycle according to the evaluation grade. The method further comprises an environmental fluctuation identification step and a step of adaptively updating the evaluation threshold value and the environmental fluctuation threshold value based on the historical cycle evaluation grade distribution and / or the environmental fluctuation cycle number proportion which are not marked as environmental fluctuation. The problems that in the prior art, decision making is not visual, evaluation standards are static, and optimization targets cannot be flexibly switched are solved, semantic decision making, standard self-evolution and multi-target self-adaptive optimization are achieved, and the operation energy efficiency of an ultrafiltration system under different working conditions and the long-term health of a membrane are remarkably improved.

The utility model relates to a new lifting mechanism for container relates to the technical field of logistics equipment, it includes lifting seat assembly, is provided with main rod cover, pull frame on lifting seat assembly, main rod cover is U-shaped opening structure, pull frame is located main rod cover opening place outside, is provided with trapezoidal screw rod in main rod cover, is provided with a plurality of transmission guide seat on pull frame, lifting seat assembly is provided with drive motor and trapezoidal screw rod transmission connection away from pull frame side, pull frame both ends are provided with first fixed support, second fixed support through connecting rod, drive trapezoidal screw rod through adopting motor and drive lifting support to carry out lifting movement, and a plurality of groups of lifting mechanisms are clamped and fixed to container, not only can obtain stable lifting effect, but also faster lifting speed, and have self -locking function, can prevent the falling event from happening caused by accident in the lifting process.

The application provides a biodegradable composition and a preparation method and application thereof, the biodegradable composition comprises 59-94 parts of biodegradable polyester, 1-6 parts of polylactic acid, 5-35 parts of starch and 1-10 parts of plasticizer in terms of weight parts; the D90 value of the starch after being dispersed with ethanol as a solvent is recorded as D1, the D90 value of the starch after being dispersed with a 30% ethanol aqueous solution as a solvent is recorded as D2, and 1.0<=D1 / D2<=1.8. In the application, the biodegradable composition has good puncture resistance and lifting performance, and the durability of the film is improved.