408results about How to "Reduce the ratio" patented technology

The invention discloses a short-term photovoltaic power generation power prediction method adaptive to weather change, which comprises the following steps of: firstly, acquiring meteorological data around a photovoltaic panel and power data of a photovoltaic module, preprocessing the data, and dividing a training set and a test set according to a proportion; according to the method, a Bi LSTM-Attention model based on ISSA optimization is constructed, photovoltaic power generation power prediction is realized by capturing time sequence characteristics and historical information of input data, meanwhile, a mean square error between a predicted value and a true value is calculated to continuously fit the predicted value, prediction model parameters can be updated, model self-learning is realized, and the prediction efficiency is improved. And the accuracy of the short-term photovoltaic power prediction value of the prediction model is further improved. According to the method, the short-term prediction precision of the photovoltaic power generation power under different weather conditions is improved, so that a photovoltaic grid-connected system is helped to respond to the control parameter design of the power grid stability requirement, and the support capability of photovoltaic power generation on the power grid is improved.

The invention belongs to the technical field of automatic control, and particularly relates to an automatic proportioning control system for mine intersection filling materials. The system comprises a data acquisition and dynamic monitoring unit, an intelligent control and optimization calculation unit and an automatic execution unit, the data acquisition and dynamic monitoring unit is used for defining a multi-component proportion constraint and a total mass constraint, calculating the real-time local concentration of each component of the filling material slurry and establishing a comprehensive objective function for measuring the filling performance; the intelligent control and optimization calculation unit is used for constructing a pressure penalty function to quantify an overrun risk according to the determined pressure safety upper limit; dynamically solving the optimal ratio; and the automatic execution unit is used for converting the optimal ratio into the feeding flow of each component, and is controlled and executed through a pump valve. Under the complex mine working condition, the component proportion and the pump valve control instruction can be adjusted in real time, so that the stability of the filling material performance and the safety of the conveying process are guaranteed.

The invention relates to the technical field of general image data processing or generation, in particular to a soybean germplasm resource high-throughput measurement method based on image recognition, and the method comprises the steps: obtaining a correction image of a target measurement object; based on the corrected image, pod contour image parameters and grain contour image parameters are extracted, and size correction is carried out on the image; calculating a pod length parameter, a grain length parameter, a pod width parameter and a grain width parameter based on the corrected image; obtaining a pod width change curve based on the pod width parameter; calculating the pod number based on the pod width change curve; extracting colors based on the corrected image to obtain pod color data and grain color data; and verifying a pod length parameter, a grain length parameter, a pod width parameter, a grain width parameter, pod color data and grain color data based on the decision coefficient and the root mean square error. The problems that in the prior art, time and labor are consumed, and precision is low are solved.

The invention discloses a neural network training method suitable for memristor type brain-like chip hardware deployment. According to the method, a cross array equivalent circuit is extracted through a partial element equivalent circuit method in a training stage, and a time domain transient simulation solving process of the equivalent circuit of the cross array is integrated into gradient propagation, so that the network can learn and adapt to the output characteristics of the cross array in the training process; furthermore, an unstructured dynamic pruning method based on a weight threshold is introduced, the memristor proportion in a low resistance state is effectively reduced, sneaking paths in the cross array are inhibited, and meanwhile, the operation cost of the cross array is reduced. Compared with a traditional training method, the method provided by the invention can significantly enhance the stability and precision of the neural network during hardware deployment, has wide applicability, and can be used for neural network training and deployment optimization of various advanced memory devices.

The invention relates to the technical field of composite materials, in particular to a long glass fiber reinforced plastic preparation process autonomous regulation and control method based on image vision, which comprises the following steps: judging the color difference interval of glass fiber and a standard sample, and judging whether floating fiber exists in colloidal particles or not according to the color difference interval; judging whether the floating fiber condition is in a first floating fiber degree or a second floating fiber degree according to the floating fiber ratio; in the first fiber floating degree, judging that the fiber floating reason is insufficient and non-uniform impregnation according to the diameter difference between the material diameters; judging whether the equipment parameters are in a preset range, and adjusting the equipment parameters; in the second floating fiber degree, the deviation condition is judged according to the diameter difference value of the materials; and judging whether the offset degree is a first category or a second category according to the offset, analyzing the offset trend, and adjusting the proportion or traction force of the polypropylene resin. By performing image view analysis on the colloidal particles prepared from the long glass fiber reinforced plastic, the reason of fiber floating is judged, and the preparation process is correspondingly regulated and controlled.

The invention discloses a beta < + >-gamma-gamma coincidence positron annihilation lifetime-momentum correlation spectrometer, and belongs to the technical field of nuclear detection. The spectrometer comprises a positron annihilation life detection module, a positron annihilation gamma photon energy detection module, a signal acquisition module and a control and analysis module, and the positron annihilation life detection module is used for acquiring a life part in an AMOC spectrum; the positron annihilation gamma photon energy detection module is used for acquiring a momentum part in an AMOC spectrum by detecting gamma photons generated by positron annihilation; the signal acquisition module is used for acquiring signals generated by the positron annihilation life detection module and the positron annihilation gamma photon energy detection module; the control and analysis module is used for controlling the signal acquisition module and obtaining an AMOC spectrum based on signals acquired by the signal acquisition module. According to the method, the coincidence counting rate can be effectively improved, good coincidence time resolution and extremely low source components are achieved, and the construction cost of a spectrometer can be reduced.

The invention discloses a production method of ultralow FeO sintered ore, and belongs to the technical field of ferrous metallurgy. The method comprises the following steps: dividing fuel into a fuel I and a fuel II, and mixing and granulating the fuel I and a sintering raw material to obtain a sintered material; distributing the sintered material to a sintering machine, and then distributing the fuel II on the surface of the sintered material; igniting, preserving heat, sintering and cooling; in the sintering process, an oxygen-enriched gas medium is blown to the surface of the sintered material; in the cooling process, air draft cooling is conducted on a sintering machine, and then materials are discharged into a circular cooler to be cooled. According to the method, the oxygen potential of a sintering material layer is improved by reducing the proportion of sintering fuel, so that the FeO oxidation efficiency of the sintered ore is improved, and ultralow FeO < lt > can be produced; by means of the method, the solid fuel consumption of sintering and the FeO content of the sintering ore can be greatly reduced, the reducibility of the sintering ore can be improved, the coke ratio of a blast furnace can be reduced, and therefore the overall fuel consumption level of the ironmaking process is reduced.

The invention discloses a fixed budget sorting preferential method and system and a storage medium, and relates to the technical field of network architectures, and the method comprises the following steps: S1, dividing all candidate schemes into a plurality of groups, and carrying out the initialization setting; s2, based on a multi-round mechanism, independently executing a local selection process of a group of candidate schemes by each processor to obtain a local optimal candidate scheme; s3, each processor generates an additional observation value for the local optimal candidate scheme by using the remaining sampling budget; and then, calculating a sample mean value of the additional observation value of each local optimal candidate scheme, and selecting the optimal candidate scheme with the maximum sample mean value as the optimal candidate scheme. According to the method, the problem of large-scale fixed budget sorting preferential selection can be efficiently solved, the friendliness of user experience is ensured, and good expandability is achieved.

The invention discloses an application of probiotics Blauria winteriae in the preparation of a medicine or food for improving or treating the inflammatory bowel disease of children, and relates to the field of medicines or foods for improving or treating the inflammatory bowel disease of children. According to the invention, the probiotic Blauria wexlerae is used as an effective component to be prepared into medically and food acceptable dosage forms, so that the children inflammatory bowel disease can be obviously improved or treated, and the application value of the probiotic is improved.

The invention discloses a zinc-bromine flow battery functional diaphragm and a preparation method and application thereof.The zinc-bromine flow battery functional diaphragm comprises a porous diaphragm with negative electricity, a plurality of first coatings and a plurality of second coatings, the first coatings and the second coatings are alternately arranged on the outer side of the porous diaphragm, the first coatings are positively charged, and the second coatings are negatively charged; the outermost layer of the zinc-bromine flow battery functional diaphragm is the second coating, and the sum of the number of the first coating and the number of the second coating is not less than 2. The zinc-bromine flow battery functional diaphragm disclosed by the invention is spontaneously assembled layer by layer through the porous diaphragm with negative electricity, the first coating with positive electricity and the second coating with negative electricity, realizes effective connection and fixation through electrostatic interaction, and resists long-term repeated washing of electrolyte in the running process of a galvanic pile.

The invention provides an X-ray photovoltaic radiation cell based on a gallium-containing semiconductor and a preparation method of the X-ray photovoltaic radiation cell. The gallium-containing semiconductor X-ray radiation photovoltaic cell comprises a gallium-containing semiconductor transduction unit and an X-ray radiation source 55Fe arranged on the semiconductor transduction unit, wherein the semiconductor transduction unit containing gallium comprises at least one of GaAs (gallium arsenide), GaInP (gallium indium phosphide), GaP (gallium phosphide) and Ga2O3 (gallium trioxide). According to the invention, the structure of a radiation photovoltaic cell is adopted, the output power density of an X-ray radioactive source 55Fe can be effectively improved, the penetration depth of the X-ray source 55Fe in a semiconductor can be effectively shortened by taking GaAs, GaInP, GaP and Ga2O3 as semiconductor materials, and meanwhile, the collection capability of current carriers is effectively improved by adjusting the total thickness of a semiconductor transduction unit and the doping concentration of each layer, so that the performance of the X-ray source 55Fe is improved. And finally, the preparation of the X-ray radiation photovoltaic cell with high output power and high energy conversion efficiency is realized.

The invention provides a control device for an intercooling bypass and an EGR cooler bypass in an engine, and belongs to the technical field of engines, the control device comprises a multi-way butterfly valve provided with at least three airflow channels, and the input end of the multi-way butterfly valve is communicated with a supercharger; the EGR cooler is arranged on the EGR cooling branch, one end of the EGR cooling branch communicates with the EGR loop, and the other end of the EGR cooling branch communicates with the intake manifold; one end of the EGR bypass branch communicates with the EGR loop through a first airflow channel of the multi-way butterfly valve, and the other end of the EGR bypass branch communicates with the EGR cooling branch and is located between the EGR cooler and the intake manifold; one end of the inter-cooling bypass branch is communicated with the intake manifold, and the other end of the inter-cooling bypass branch is communicated with a second airflow channel of the multi-way butterfly valve; and one end of the intercooler communicates with the intake manifold, and the other end of the intercooler communicates with the third airflow channel of the multi-way butterfly valve. By additionally arranging the multi-way butterfly valve, the purpose of adjusting the cooling strategies of the EGR system and the intercooling system at the same time is achieved.

The utility model relates to the technical field of variable-frequency centrifugal water chilling units, and discloses an anti-incrustation variable-frequency centrifugal water chilling unit which comprises a supporting frame, an evaporator, a centrifugal compressor and a condenser, and a second water inlet is formed in the position, close to the top end, of the front end of the condenser. The bottom ends of the first water inlet and the second water inlet are each provided with a slag discharging opening. The second water inlet is formed in the end face of the condenser and used for water inflow, the annular plate and the mounting plate are connected and mounted through the bolts, the filter screen is used for filtering treatment, then the transmission shaft can be driven to rotate after the driving motor works, and at the moment, the cleaning rod rotates correspondingly, and meanwhile the cleaning effect is improved. The cleaning brush can clean residues on the surface of the filter screen, at the moment, the residue discharging opening can be used for residue discharging treatment, and therefore in the working process, the overall inflow water filtering work is well improved, the proportion of impurities in water flow is reduced, and scale formation is reduced.

The utility model particularly relates to a novel automobile anti-roll bar damper which can effectively reduce side roll when an automobile turns and improve the linear driving quality. The damper comprises a damping spring, a left end fixing hoop and a right end fixing hoop, and dynamic damping is adjusted through stretching out and drawing back. The damper is directly connected with a chassis anti-roll bar through the damping spring and one end of the fixing hoop, the other end of the damper is directly connected with an anti-roll bar suspender or connected with a lower straight arm or a lower bent arm or a nearby fixing point, and the angle change and vibration of the anti-roll bar are reduced when a vehicle moves by reinforcing the connection damping of the anti-roll bar and the anti-roll bar suspender or the lower swing arm; the stability of the anti-roll rod during movement is improved on the whole, the purpose of reducing side roll of the vehicle during turning is achieved, and meanwhile the comfort of the vehicle during straight driving is improved.

According to the epoxypropane production system and method with the high conversion rate and the high yield, the interior of the reactor is divided into the upper section and the lower section through the production system, the accurate feeding proportion of three materials is provided, and the mode of segmented control and distributed feeding is provided; propylene and most of hydrogen peroxide diluted by a solvent are added into a first reaction section at the bottom through a first-stage feeding distributor for reaction, and then a reaction mixed solution of the residual solvent and hydrogen peroxide is supplemented into a second reaction section through a second-stage feeding distributor, so that reaction materials are uniformly mixed for reaction; the problem that the temperature is too high and hydrogen peroxide is decomposed due to uneven mixing caused by one-time adding or non-distributed adding of materials is avoided, the conversion rate of the materials is increased, meanwhile, fins are arranged on the outer sides of the catalytic tubes, the heat exchange area is increased, reaction heat is discharged in time, hydrogen peroxide decomposition is avoided, and the catalytic effect is improved. The selectivity and the yield of the product epoxypropane are further improved.

The invention relates to a plasmid purification method for improving a superhelix ratio. The method comprises the following steps: (1) carrying out flocculation impurity removal, microfiltration and ultrafiltration concentration on a pyrolysis neutralization solution of fermentation thalli to obtain a plasmid crude extraction concentrated solution; (2) carrying out affinity chromatography purification on the plasmid crude extraction concentrated solution, wherein a chromatography filler adopted by the affinity chromatography purification is Capto Plasmid Select produced by Cytiva Company; and (3) carrying out anion chromatography purification on the plasmid solution after the affinity chromatography purification, wherein the chromatography filler adopted by the anion chromatography purification is Capto Q ImpRes produced by Cytiva Company. The plasmid purification method disclosed by the invention can be used for effectively removing polymers generated by fermentation, reducing the open-loop proportion and improving the superhelix monomer proportion of the plasmid, the pressure of upstream development of thalli with high expression quantity and high superhelix proportion is greatly relieved, and the plasmid purification method disclosed by the invention is simple and efficient, can be effectively enlarged to a production scale and has a relatively high practical value.

The invention relates to a fireproof composite material deck which is composed of a foam sandwich and composite material skin layers arranged on the upper side and the lower side of the foam sandwich. The composite material skin layer comprises a fiber pouring layer and a hand lay-up layer. In implementation, the mode that the hand lay-up layer and the pouring layer are combined is adopted on the upper portion and the lower portion of the foam sandwich respectively, so that the upper surface and the lower surface of the composite material deck are both provided with efficient flame-retardant filler, the oxygen index of the composite material deck is larger than or equal to 36, and if the oxygen index is generally larger than or equal to 32, the composite material deck belongs to a flame-retardant material; and meanwhile, the ratio of the accelerant in the hand lay-up layer is relatively low, so that the pre-curing of the resin in the hand lay-up layer in the laying and pouring molding process can be effectively prevented, and the product quality is improved.

The invention relates to the field of automatic driving testing, and provides an automatic driving dangerous scene generation method and system based on confrontation reward training, and the method comprises the steps: initializing a driving simulation environment of a multi-lane road; a punishment action is randomly generated based on scene state parameters in the vehicle data, the scene state parameters, the punishment action and corresponding action parameters form a state action pair, and under the condition of no historical action similarity punishment, a state action value is calculated; performing historical action similarity punishment on the punishment action through a punishment function, and calculating a state action value after the historical action similarity punishment is updated; and updating the reinforcement learning model according to the difference value between the state action value in the reinforcement learning model and the expected state action value to guide the generation of an automatic driving dangerous scene. According to the method, the efficiency and the quality of automatic driving system testing are remarkably improved, meanwhile, the scene quality loss is reduced, and the diversity and the practicability of the scene are improved in a short training period.

The invention relates to the technical field of traditional Chinese medicines, in particular to a traditional Chinese medicine composition liniment for treating vitiligo and a preparation method of the traditional Chinese medicine composition liniment. The concentrated liquid medicine, 3-OH phlorizin and vegetable oil are mixed, and the liniment is obtained; and bottling and storing. Various Chinese herbal medicine components are prepared into the liniment, the liniment aims at improving skin conditions and promoting pigment recovery in an external application mode, the extracted Chinese herbal medicine components and 3-OH phlorizin are added into the vegetable oil, the adding amount and proportion are controlled, the dispersion uniformity and effect of the final liniment are ensured, parameters are determined according to actual working procedure conditions, and the liniment has the advantages of being simple in structure, convenient to use and high in practicability. According to the liniment preparation device, production requirements of different batches are flexibly met, so that stability and intelligence of batch production are achieved, intelligence of the production process is achieved by automatically monitoring and adjusting opening and closing of the feeding valve, the liniment preparation process is optimized, product quality and stability are improved, and production intelligence and adaptability are enhanced.

The invention discloses a zinc-bromine flow battery diaphragm with a bromine fixing effect, and a preparation method and application thereof, and relates to the field of zinc-bromine flow batteries. The zinc-bromine flow battery diaphragm comprises a porous diaphragm and a hydrophilic coating arranged on one side or two sides of the porous diaphragm, the hydrophilic coating is formed by coating an activated porous diaphragm with hydrophilic slurry, and the activation mode comprises any one of ozone treatment, plasma treatment or 60Co gamma-radiation treatment. According to the zinc-bromine flow battery diaphragm disclosed by the invention, the hydrophilic coating is arranged on the porous diaphragm, so that elemental bromine and polybrominated substances can be effectively adsorbed and fixed, the self-discharge phenomenon of a battery is reduced, and the coulombic efficiency of an electric pile is improved.

The invention discloses a preparation method of a self-supporting three-dimensional electrocatalyst with an adjustable pore structure and ordered metal distribution. The method is divided into the following two methods according to different adding steps of metal nanoparticles or metal precursors: the method I comprises the following steps: 1) preparing a porous organic polymer by adopting an ice template method; 2) dissolving a metal precursor in an ethanol solution at room temperature, mixing with the porous organic polymer carrier, and standing until ethanol is completely volatilized to obtain a porous organic polymer with orderly distributed metals; and 3) performing high-temperature carbonization on the porous organic polymer with orderly distributed metals to obtain the porous organic polymer. The method II comprises the following steps: a) preparing a porous organic polymer with orderly distributed metals by adopting an ice template method; and b) carrying out high-temperature carbonization on the porous organic polymer with orderly distributed metals. The application of the porous organic polymer material in the fields of catalysis, composite material modification, supercapacitors and the like in other fields can be expanded through copolymerization or addition of functional fillers (such as magnetic particles, conductive fillers and the like).

The invention relates to the technical field of amino acid compositions, and discloses a compound amino acid composition for enhancing telomerase activity, which comprises the following components (by weight): 20-25 parts of L-arginine; 15 to 20 parts of L-lysine; 25 to 30 parts of L-glutamine; 10 to 15 parts of L-serine; 5 to 8 parts of L-glycine; 3 to 5 parts of L-proline; 2 to 4 parts of N-acetyl-L-cysteine; 1 to 2 parts of L-tryptophan; 1 to 2 parts of beta-alanine; 2 to 3 parts of L-carnitine; 1-2 parts of taurine; through the synergistic effect of multiple mechanisms, the compound amino acid composition not only significantly enhances the telomerase activity (up to 195%), but also can maintain the telomere length, inhibit cell aging and provide antioxidant protection. The comprehensive regulation effect is derived from a unique metabolic network formed among the components, and mutual promotion and regulation are realized. Experimental results show that the long telomere length (8.3 kb vs control group 7.1 kb) can be maintained in 30-day long-term culture.

The invention relates to the technical field of gypsum, and discloses a slope protection material based on building beta gypsum as well as a preparation method and a construction method thereof, the slope protection material comprises 40-55 parts of building beta gypsum, 8-15 parts of phosphogypsum, 2-5 parts of a curing agent, 10-20 parts of fly ash and 40-60 parts of water; the curing agent comprises calcium hydroxide, potassium carbonate, acrylic resin and calcium carbonate. After the slope protection material provided by the invention is cured, the leachate of the slope protection material reaches the first-grade discharge water standard through a vibroflotation water method. The innovation ensures the environmental protection property of the material in the application process, solves the problem of low water stability of the traditional beta gypsum, increases the water softening coefficient of the building beta gypsum to 0.7, solves the influence on the environment in the treatment process, and meets the requirements of green construction and sustainable development.

The invention discloses a tandem catalysis method for improving the catalytic efficiency of preparing higher alcohol by CO2 hydrogenation, which comprises the following steps: two sections of fixed bed reactors are connected in series, the first section of reactor is filled with a catalyst for preparing olefin by CO2 hydrogenation, and the second section of reactor is sequentially filled with an olefin hydroformylation catalyst and a catalyst for preparing alcohol by aldehyde hydrogenation. According to the invention, segmented catalysis is carried out on the complex process of preparing higher alcohols through CO2 hydrogenation, and a catalyst for preparing olefins through CO2 hydrogenation, a hydroformylation catalyst and an aldehyde hydrogenation catalyst are respectively arranged in an upstream-segment reactor and a downstream-segment reactor, so that the efficiency and selectivity of preparing higher alcohols through CO2 hydrogenation are improved; through tandem catalysis, the selectivity of by-product hydrocarbons can be effectively reduced, the utilization rate of carbon is improved, the selectivity and space-time yield of higher alcohols are remarkably improved, and the separation cost of products is reduced.

The present invention provides an industrially advantageous method for producing sulfone derivatives useful as herbicides and intermediates thereof.

The present invention relates to a neodymium iron boron rare earth magnet and a preparation method thereof, and relates to the technical field of rare earth magnet preparation. By designing the coordinated diffusion of a diffusion source and a magnet, diffusion and aging treatment are performed to obtain a high-performance heavy rare earth-free magnet. The diffusion source is prepared by coating a layer of heavy rare earth-free alloy film on a diffusion source sheet, and performing aging treatment to form a new type of diffusion source, wherein the diffusion source sheet is R α RH δ M β B γ Fe 100‑α‑β‑γ‑δ The heavy rare earth-free film is a film with the chemical formula R n M m , aging treatment is carried out to form a new diffusion source; the chemical formula of NdFeB magnet is R a M 1b M 2c B d Fe 100‑a‑b‑c‑d After the magnet is diffused with Dy diffusion source, the remanent magnetism decreases by less than 0.15kGs, and the Hcj increases by more than 8kOe. After the magnet is diffused with Tb diffusion source, the remanent magnetism decreases by less than 0.15kGS, and the Hcj increases by more than 11kOe.

The present invention relates to a novel low-voltage switch electrical appliance with a built-in cooling system, comprising a low-voltage switch electrical appliance body, a busbar is arranged on the low-voltage switch electrical appliance body, a current transformer is installed on the busbar, a power module and a fan are installed on the low-voltage switch electrical appliance body, the current transformer is connected to the power module, the power module is connected to the fan, a heat dissipation channel and a wind circulation channel are also provided on the shell of the low-voltage switch electrical appliance body, the heat dissipation channel is arranged inside the low-voltage switch electrical appliance body, and the heat dissipation channel runs through the low-voltage switch electrical appliance body, one end of the heat dissipation channel matches the position of the fan, the wind circulation channel is arranged on the shell of the low-voltage switch electrical appliance, and a cooling air duct is formed between the heat dissipation channel and the wind circulation channel.

The invention provides a preparation method of a high-selectivity semi-hydrogenation MOF (Metal Organic Framework) supported palladium catalyst for catalyzing acetylene. According to the invention, 2-methylimidazole is used as a ligand, Zn < 2 + > is used as a metal node, water is used as a solvent, and a ZIF-8-dia carrier is synthesized at room temperature by controlling the molar ratio of Zn < 2 + > to 2-methylimidazole; and depositing Pd < 2 + > on the ZIF-8-dia carrier by using a reducing agent to synthesize the MOF supported palladium catalyst. Strong electron interaction is formed between Pd nano-particles and a carrier loaded in the MOF loaded palladium catalyst, a rich Pd-N structure is constructed on the interface of the Pd nano-particles and the carrier, formation of Pd0 species is inhibited, the hydrogen activation capacity of the Pd nano-particles is reduced, excessive hydrogenation of acetylene is inhibited, and therefore the selectivity of ethylene is improved; the catalyst shows excellent catalytic performance in acetylene hydrogenation reaction, at 160 DEG C, the acetylene conversion rate reaches 100%, the ethylene selectivity is 85%, and the catalyst has excellent durability and stability.

The invention discloses polymer slurry, a high-performance and high-safety lithium battery diaphragm as well as a preparation method and application of the high-performance and high-safety lithium battery diaphragm. The polymer slurry comprises a cosolvent, an additive, an aramid polymer and an organic solvent I, wherein in the synthetic raw materials of the aramid fiber polymer, the molar ratio of a phthaloyl chloride monomer to a phenylenediamine monomer is (0.8-0.99): 1. The lithium battery diaphragm comprises a base membrane and a porous aramid fiber membrane loaded on the base membrane, and the porous aramid fiber membrane is obtained by solidifying polymer slurry coated on the base membrane. The invention designs and provides the slurry containing the low-molecular-weight para-aramid nanofiber, the slurry is coated and prepared into the lithium metal battery diaphragm, and the cycle performance of the lithium metal battery can be greatly improved; and the lithium battery diaphragm prepared by the invention is relatively high in thermal stability and mechanical strength, and is beneficial to improving the safety of the lithium battery.

The invention relates to an optimal design method for a thread form angle of a planetary roller lead screw pair, and relates to the technical field of planetary roller lead screws, the method comprises the following steps: drawing standard thread form three-dimensional mathematical models of a lead screw, a roller and a nut in three-dimensional software according to thread parameters of the planetary roller lead screw pair; performing meshing analysis on the screw rod or the nut and partial thread section of the roller in a simulation module of the three-dimensional software; the thread angle value of the first lead screw or the second nut is adjusted based on the meshing condition of partial thread sections of the first lead screw and the first roller in the standard structure or the meshing condition of partial thread sections of the second nut and the second roller in the reverse structure. Therefore, on the premise that the first pin roller and the first lead screw or the second nut and the second pin roller do not interfere with meshing, the mutual meshing position is optimized. According to the design method, the thread angle value of the lead screw or the nut is optimized, the problem of poor thread meshing is solved, the bearing capacity and the transmission efficiency are improved, thread abrasion is reduced, and the service life is prolonged.