134results about How to "Reasonable selection" patented technology

The invention discloses an ultralow emission method and device for split-type flue gas desulfurization and dust removal.The device comprises a desulfurization tower and an oxidization circulation tank arranged outside the desulfurization tower.The desulfurization tower and the oxidization circulation tank are connected through a pipeline.A hydromechanical combined super demister is arranged at the top of the desulfurization tower.The ultralow emission method and device for split-type flue gas desulfurization and dust removal have the advantages that the desulfurization efficiency is high (>=99%), and the adaptability to coal types and boiler load changes is high; each stage of absorption and circulation are relatively independent, the density and pH value of absorption liquid are controlled in a partitioned mode, the output of aerosol is controlled in the process, the system ammonia escape is low (<2.5 mg / Nm<3>), and the concentration of emitted particles is low (<5 mg / Nm<3>); the specific humidity electrostatic-demisting energy consumption is low, and sewage treatment is omitted; the desulfurization tower and the oxidization circulation tank are separately arranged, and thus the tower height can be reduced; the system resistance of the device is small (<2000 Pa), reasonable equipment model selection can be carried out according to different conditions of flue gas, and thus investment and energy consumption are reduced.

The process of extracting and separating huperzine A from huperzine serrate includes the steps of crushing huperzine serrate, reflux extracting in organic solvent, regulating acidity, filtering, chromatographic separation of the filtrate with cationic exchange resin, eluting, concentrating to obtain extractum, eluting on silica gel column with mixed eluant, collecting the eluted liquid, concentrating, letting stand to separate out huperzine A, and re-crystallizing to obtain refined huperzine A product. The present invention has high yield, low production cost and huperzine A product purity as high as 98 %.

The utility model relates to a method for extracting high-content stevioside A3 glycoside, which includes six steps: (1) water extraction: the ground stevia rebaudiana is extracted with water and filtered; (2) resin separation: Filtrate passes through a macroporous resin column and is eluted by alcoholic solvent, stripping liquid passes through a duolite column, and effluent liquid is collected; (3) decolorization: decolourant is added into the effluent liquid, which is then filtered and dried to produce a crude product: (4) crystallization: the crude product is resolved into alcoholic solvent, kept static and filtered to obtain crystals; (5) recrystallization: alcoholic solvent is used again for multiple recrystallizations; (6) washing: the crude product is washed by anhydrous alcoholic solvent and dried to obtain the finished product. The purity of the produced high-content stevioside A3 glycoside is high, so the high-content stevioside A3 glycoside can better improve the taste, the quality and the grade of food, and the method is reasonable and can be easily implemented.

The invention provides a manufacturing method for a composite artificial board (LVS), wherein plywoods, particleboards and medium-density (high-density) fibreboards have the insurmountable defects of easiness to warp, deform and crack, bad colouring property, incapacity of engraving and routing surface, and the like while having good mechanical strength respectively due to different composition units and different machining processes. The manufacturing method for a composite artificial board (LVS) comprises the following steps of: using medium-high density fibreboards as surface layers (a front board and a back board), and using multilayer plywoods or particleboards as the lining layer of a base material; before assembly for the composite artificial board (LVS), performing galling treatment on the thin-type medium-density (high-density) fibreboards at first, and then performing double-surface gluing on a core layer material, and finally conveying the fibreboards and the core layer material to a hot press to perform hot-pressing treatment. According to the invention, the problems of the common plywoods and particleboards are solved, the dimensional stability and the compressive strength of the board are improved, and the use fields of the composite board are extended and expanded. More importantly, via the composite artificial board (LVS), both large-diameter-class wood and small-diameter-class brushwood can be utilized, thus achieving the purpose of comprehensively utilizing a whole tree.

The invention discloses a formula of an insulating and heat-conducting PVC (polyvinyl chloride) cable material. The cable material is prepared from raw materials in parts by weight as follows: 33-45 parts of PVC resin, 8-15 parts of low-density PVC, 5-15 parts of heat-conducting filler, 4-6 parts of carbon fibers, 2-5 parts of glass fibers, 4-10 parts of aluminum oxide, 5-10 parts of magnesium hydroxide, 1-3 parts of an anti-aging agent, 8-13 parts of chlorinated paraffin, 3-6 parts of a thermal stabilizer, 3-5 parts of a coupling agent, 1-4 parts of a plasticizer, 3-6 parts of nanometer titania, 3-9 parts of nano tin antimony oxide powder, 5-7 parts of mica powder and 3-6 parts of kaolin. The formula has the advantages that the raw materials are selected reasonably and have good compatibility, the manufactured product has good mechanical performance, good flame retardance, good insulativity, long service life and the like, and substances produced during an emergency do no harm to human bodies and natural environment.

The invention relates to a fiber and polytetrafluoroethylene plate rubber combined shock insulation support, and belongs to the field of shock insulation for room buildings. The support mainly comprises rubber layers, fiber layers and polytetrafluoroethylene plates which are staggered and laminated according to a sequence of a first rubber layer, one of the polytetrafluoroethylene plates, a second rubber layer, one of the fiber layers and a third rubber layer; a plurality of layers are laminated, and the rubber layer is arranged on the top, so that a laminated body is formed; end steel plates are respectively arranged on the upper end face and the lower end face of the laminated body, and a rubber protection layer is arranged around the lateral direction of the laminated body; and the final support is formed by vulcanization and bonding. The support is light in weight and low in assembly cost; and the vertical rigidity and the bearing capacity of the support can be changed by adjusting the number of polytetrafluoroethylene plates in the support.

The invention discloses Chinese medical herbs aerosols for treating anchylosis, painful swelling and a preparation method thereof. The Chinese medical herbs aerosols comprises the following components according to the percentage by weight: 10-20 of clematis chinensis, 10-20 of cassia twig, 10-20 of salvia miltiorrhiza, 10-20 of lycopodium calvatum, 5-15 of angelica, 5-15 of heracleum hemsleyanum michaux, 2-10 of frankincense, 2-10 of myrrh, 2-10 of rhizoma zingiberis, and 2-10 of safflower; the component and usage of accessories is 05-2 of Tween-80 according to the percentage thereof of the total volume of the liquid medicine. The preparation method thereof is as follows: medicinal materials are ground and extracted by 70%-95% of ethanol solution hot reflux, the extracting solution is decompressed and concentrated into dense paste, medicinal material residue is added with water for hot extracting, the extracting solution is concentrated into a defined volume and added with the Tween-80, stirred, dissolved, and added into the dense paste and filtered. The pharmacodynamics experiment proves that the medicine has obvious functions of anti-inflammatory, detumescence, relieving pain and promoting the recovery of the function of joint.

The invention discloses sterilization itch-relieving handmade soap which comprises the following materials in part by weight: 450-550 parts of fundamental vegetable oil, 61-75 parts of sodium hydroxide, 153-187 parts of distilled water, 13.5-16.5 parts of neem oil, 4.5-5.5 parts of frankincense essential oil, 4.5-5.5 parts of myrrh essential oil, 4.5-5.5 parts of lavender essential oil, 4.5-5.5 parts of cypress essential oil, and 4.5-5.5 parts of artemisia argyi essential oil. The production method of the handmade soap comprises the following steps: saponifying the fundamental vegetable oil with the temperature of 38-42 DEG C by using a sodium hydroxide aqueous solution with the temperature same as that of the fundamental vegetable oil; when a soap liquid reaches a thick state, adding the mixed oil of the five kinds of essential oils and the neem oil, uniformly stirring, pouring into a mould, and keeping the temperature of 38-42 DEG C for 48 hours; finally, demoulding and airing. According to the invention, plenty of bubbles are generated by the handmade soap, the detergency of the soap is excellent, the various essential oils can quickly permeate into skin to kill mites, restrain bacteria, relieve itch, clear heat, remove toxicity and repair skin, and the sterilization itch-relieving handmade soap is quite suitable for skin of the aged.

The invention relates to a construction method for enabling a cable to pass through a barrier. The construction method for enabling the cable to pass through the barrier sequentially includes following steps: firstly, confirming a pipe hole path so as to obtain the total length and the specification of a cable sleeve, prefabricating the cable sleeve by sections, threading a steel wire lead rope through the cable sleeve in advance, clearing the inner wall of the cable sleeve section by section, and performing anticorrosion and mouth repairing on the cable sleeve after a qualified pressure test on the cable sleeve is completed; then, performing a simulation experiment, obtaining a slide friction coefficient of the cable sleeve, figuring out the maximum slide traction resistance, judging whether the maximum slide traction resistance is larger than permissive pull force of the cable, and if yes, installing idler wheel hoops for a second experiment so as to obtain a rolling friction coefficient of the cable sleeve, figuring out the maximum rolling traction resistance during the cable passing process, and confirming specifications of traction facilities of a main steel wire rope and the like; finally, drilling pipe holes, enabling the cable to pass through the cable sleeve, using a winching to tow the cable, using an excavator to assist in cable feeding, feeding the cable in the cable sleeve for a section after installing each batch of the idler wheel hoops until the whole cable completely passes through the cable sleeve, and performing a performance test on the cable which passes through the cable sleeve after two end mouths of the cable sleeve are blocked. The construction method for enabling the cable to pass through the barrier can substantially reduce passing resistance of the cable, and is safe and reliable.

The invention discloses an improved energy-saving AAO rural domestic sewage treatment method. The method comprises the steps that 1, an improved energy-saving AAO rural domestic sewage treatment device is built, and the device comprises a sewage water inlet pipe network, a grille, an adjusting tank, an anaerobic tank, a lifting pump, an anoxic tank, an aerobic tank, a blower, an oxygen-containing mixed liquid distribution groove, a sedimentation tank, a water outlet pipe, a sludge storage tank and a sludge return pump which are connected in sequence; 2, a sewage collecting pipe network is laid by taking a natural village as a unit, and after sewage is treated by the improved energy-saving AAO rural domestic sewage treatment device, clear water flows automatically for discharging. According to the technology, the position of the lifting pump in the process and the height of the anaerobic tank are adjusted, an oxygen-containing mixed liquid return pump is canceled, the function of AAO in the technology is not affected, and treatment effluent meets the emission standard; one pump can be reduced in management, and management is simplified. By means of the technology operation mode, the lifting pump flow is increased, pump type selection tends to be reasonable, energy consumption can be saved, and the operation cost can be lowered.

The invention discloses a cable insulation material of wearproof modified phenolic resin. The cable insulation material is prepared from, by weight, 32-36 parts of polyvinyl chloride, 30-34 parts of modified phenolic resin, 11-15 parts of silicone rubber, 4-8 parts of an ethylene-vinyl acetate copolymer, 2-6 parts of ethylene acrylic grafted maleic anhydride, 3-7 parts of an ethylene-vinylacetategrafting maleic anhydride copolymer, 1-5 parts of sodium stearate, 5-9 parts of aramid short fiber, 6-10 parts of montmorillonite, 2-6 parts of paraffin, 4-8 parts of nano-polyacrylate modified magnesium hydrate, 2-6 parts of nano calcium carbonate, 3-7 parts of nano boron nitride, 1-5 parts of microcrystalline cellulose, 2-6 parts of silane coupling agent, 4-8 parts of wearproof powder, 5-9 partsof talcum powder, 2-6 parts of zinc oxide whiskers, 1-5 parts of graphene, 1-5 parts of fullerene, 3-7 parts of antioxygen, 5-9 parts of fire retardant and 6-10 parts of filling fine materials. The wearproof performance and the fire resistance of the cable insulation material are improved, and the service life of a cable can be guaranteed.

The invention provides a batch storage battery formation quality monitoring system which comprises at least one production line monitoring unit, an identity type-in module and a monitoring center. Each production line monitoring unit comprises a plurality of monomer monitoring modules, a pack-side monitoring module and a formation measurement and control device; in the same production line monitoring unit, each monomer monitoring module is correspondingly connected with the positive poles or the negative poles of storage batteries in a storage battery pack; the monomer monitoring modules and the pack-side monitoring module of each production line monitoring unit are further connected with the corresponding formation measurement and control device, and all the storage batteries are connected with the pack-side monitoring modules; each storage battery, each monomer monitoring module and each pack-side monitoring module are respectively provided with identity identification information which is typed in through the identity type-in module and then is transmitted to the corresponding formation measurement and control device; the formation measurement and control devices in all the production line monitoring units are connected with the monitoring center. The system is suitable for being used for meeting test requirements of a large batch of batteries of storage battery manufactures and is good in real-time performance and high in test accuracy.

The invention discloses a method for rating the taste of an orange. The method comprises the following steps: (1) a sensory team pre-evaluates the taste of an orange sample, and determines key attribute indexes for taste rating; (2) sensory judgers test and evaluate the orange sample according to the attribute indexes determined in step (1); (3) the sensory evaluation results of all the attributeindexes of the sensory judgers are counted; (4) the weight evaluation results of the attribute indexes of the sensory judgers are counted; (5) the rating attribute index scores of the orange sample are calculated; and (6) the total score of the orange sample is calculated, and star rating of the taste of the orange sample is carried out. Compared with extensive evaluation methods from appearance and taste in the prior art, the, the method in the invention is systemic and scientific by obtaining the overall rating result based on the key attribute evaluation results through systemically evaluating and reasonably calculating the orange. The method can help producers to well classify oranges, and can also help consumers to reasonably select oranges according to their own needs.

The invention provides an efficient ore crushing technology and a crushing system thereof and belongs to the technical field of ore crushing. The crushing system comprises a rough crushing device, anintermediate crushing device, a first fine crushing device, a second fine crushing device, a first vibrating screen and a second vibrating screen. A raw ore material is divided with a vibration feeding machine, the raw ore material with the particle size larger than 250mm enters the rough crushing device, the raw ore material with the particle size smaller than 250mm enters the intermediate crushing device, the raw ore material enters the intermediate crushing device after being roughly crushed with the rough crushing device, the raw ore material is sent into the first vibrating screen after being crushed with the intermediate crushing device, the raw ore material with the particle size smaller than 13mm is sent into a storage bin, the raw ore material with the particle size larger than 13mm is sent into the first fine crushing device and the second fine crushing device through a vibration division funnel and enters the second vibrating screen through a material collection hopper afterbeing finely crushed, the raw ore material with the particle size larger than 13mm is sent into the second fine crushing device, and the raw ore material with the particle size smaller than 13mm is sent into the storage bin. The efficient ore crushing technology provided by the invention is reasonable in design and is high in crushing efficiency, good in crushing effect and beneficial to after-treatment through classification crushing after screening of ore material particle sizes; and with reasonable type selection of various mechanical devices, the system is stable in running and convenientto maintain and can effectively increase the yield.

The invention discloses a PVC cable sheath material which is prepared from the following raw materials in parts by weight: 50-60 parts of PVC resin, 5-10 parts of natural rubber, 5-10 parts of butadiene rubber, 5-10 parts of polyethylene, 1-4 parts of fumed silica, 1-2 parts of glass fiber, 2-5 parts of graphene, 1.5-3 parts of anti-impact modifier, 5-10 parts of nano titanium dioxide powder, 1-4 parts of thermal stabilizer, 4-8 parts of plasticizer, 4-6 parts of accelerator, 2-5 parts of barium oxide, 3-5 parts of coupling agent, 4-8 parts of calcium oxide, 5-15 parts of perlite, 5-10 parts of lubricant, 3-6 parts of diammonium phosphate and 3-6 parts of zinc borate. According to the cable material disclosed by the invention, PVC resin is adopted as the main ingredient which is accompanied by other accessories; the cable sheath material does not contain such heavy metals harmful to human and environment as lead, cadmium, hexavalent chromium and mercury, meets the standard requirements on environmental protection and is safe and environmentally friendly and thus has high wear resistance and mechanical processing property and is convenient and easy to cut; moreover, the diamagnetic property, the waterproof property, the high-temperature resistance and the chemical corrosion resistance are improved over common cable material; the biodegradation cycle is short, the production cost is low, the economic value is high, and the prospect is very broad.

A Chinese medicine in the form of capsule for treating bone tuberculosis, arthritis and wood non-healing is proportionally prepared from 10 Chinese-medicinal materials including centipede, toad venom, scorpion, borneol, etc through pulverizing, mixing and loading in capsules.

The invention discloses a working roller bending device for a double-roller rolling machine and a roller bending force control method. The rolling machine comprises an arch, a working roller and a supporting roller. The roller bending device comprises a roller bending mechanism for supplying a roller bending force to the working roller; the roller bending mechanism is provided with roller bending blocks and a roller bending beam, wherein the roller bending block are fixedly mounted in a window of the arch and symmetrically arranged at two sides of a working roller bearing block; a piston rod and an end cover are arranged at two ends of each roller bending block; the roller bending blocks, the piston rods and the end covers form a roller bending hydraulic cylinder; the piston rods act on the roller bending beam. According to the roller bending device, a fixed single oil cylinder is adopted according to the structure, and micro differential pressure control is performed; compared with the prior art, the roller bending device has the advantages that the capacity is fully utilized, the maintenance points are few, and the quantity of the oil cylinders is decreased.

The invention discloses an explosion-proof cable sheath material. The explosion-proof cable sheath material is prepared from, by weight, 30-65 parts of a polyurethane thermoplastic elastomer, 10-15 parts of urea resin, 45-60 parts of modified silicone rubber, 5-10 parts of vinyl-vinyl acetate copolymer, 20-30 parts of chlorinated polyethylene rubber, 5-10 parts of zinc chloride, 1-3 parts of zinc stearate, 3-6 parts of antimony trioxide, 15-20 parts of organic silicon resin, 12-20 parts of glass fiber, 3-9 parts of chlorinated paraffin, 10-18 parts of sodium polyacrylate, 0.5-5 parts of antioxidant and 1-6 parts of anti-aging agent. The explosion-proof cable sheath material is reasonable, has insulation performance, corrosion resistance and high-temperature resistant performance, has the advantages of being simple in preparation process, low in production cost, long in service life and the like, adopts the polyurethane thermoplastic elastomer so that long-term effective work of a cable in a high-temperature environment can be guaranteed.

The invention relates to high-adhesiveness low-temperature conductive silver paste for a solar HIT battery and a preparation method of the high-adhesiveness low-temperature conductive silver paste. The silver paste is prepared from materials, by mass, 37%-40% of silver powder, 39%-43% of silver-coated copper powder, 6%-7.5% of resin, 0%-1.5% of diluent, 2%-3% of curing agent, 0.4%-0.6% of dispersing agent, 6%-7% of first indium alloy powder and 3%-5% of second indium alloy powder. The low-temperature conductive silver paste is reasonable in component selection and low in cost, can obtain the better adhesive force and tension on a silicon wafer, has better stability in severe environments such as high temperature, high humidity and the like, and can meet the requirements of a silk-screen grid of the solar HIT battery.

The invention provides an embedded folding wing mechanism which comprises a wing piece or a rudder piece, a seat body, a torsional spring, a screw pin, a plate spring and a cylindrical pin, and the seat body is connected with an aircraft cabin; the wing pieces or the rudder pieces are hinged to the base body through cylindrical pins, rotate around the axes of the cylindrical pins and retract intoaxial grooves in the outer wall of the aircraft cabin body or are unfolded in the radial direction of the aircraft cabin body. One end of the torsional spring is connected with the seat body through ascrew pin, and the other end is connected with a cylindrical pin to provide power for outward rotation of the wing or rudder from the aircraft cabin; the plate spring is installed on the seat body, the plate spring is located between the wing piece or the rudder piece and the seat body when the wing piece or the rudder piece retracts into the outer wall of the aircraft cabin body, the wing pieceor the rudder piece extrudes the warping face of the plate spring to deform, the plate spring rebounds after the wing piece or the rudder piece is unfolded and abuts against the side face of the wingpiece or the rudder piece, and in-place unfolding is guaranteed. A longitudinal folding scheme is adopted, the structure is exquisite, the response speed is high, and good strength, rigidity, shock resistance and installation precision are achieved.

The invention discloses a cleaning and prefilming agent which is used for dissolving dirt on metal surfaces and forming inorganic films and organic films on the metal surfaces, and the inorganic filmsand the organic films intersect each other on the metal surfaces to form compact inorganic organic composite films. The ingredients of the cleaning and prefilming agent comprise organic carboxylic acid and salts thereof, sodium gluconate, inorganic zinc salt, organic acid polymers, a chelating agent, inorganic base and deionized water, and the weight percentage of all the ingredients in the cleaning and prefilming agent is 5-30% of organic carboxylic acid and salts thereof, 10-20% of sodium gluconate, 3-10% of inorganic zinc salt, 5-20% of organic acid polymers, 1-5% of the chelating agent, 10-30% of inorganic base and the balance deionized water. By means of the cleaning and prefilming agent, the purposes of protecting equipment and prolonging the equipment life are achieved, when the cleaning and prefilming agent is used for circulating cold water treatment, cleaning and prefilming can be finished at one time, adjustment of the system pH is not needed, and the cleaning and prefilming procedure is simplified.

The invention relates to a thermal-insulation and waterproof composite material, belonging to the field of thermal-insulation and waterproof materials. The thermal-insulation and waterproof compositematerial sequentially comprises a nano-silicon dioxide sol layer, a polytetrafluoroethylene micro-pore film layer, an oxford cloth layer and a thermal insulation layer, wherein the thermal insulationlayer is produced from a thermal-insulation cotton material and particularly contains the following components in parts by weight: 20-30 parts of clay clinker, 10-15 parts of alumina powder, 10-30 parts of silica powder, 20-30 parts of chromium-quartz powder, 10-15 parts of silk fibers and 2-3 parts of sepiolite nano-fibers. The thermal-insulation and waterproof composite material comprises an outer thermal insulation layer and an inner waterproof layer and can meet thermal insulation requirements, and the energy consumption can be reduced; and the waterproof layer is formed by laminating a polytetrafluoroethylene micro-pore film and coating with a nano-silicon dioxide sol by taking oxford cloth as a base layer and has excellent waterproof performance, and the service life can be guaranteed.

The invention provides a method for preparing levofloxacin hydrochloride. The method comprises preparation of 3-(2-hydroxyl-1-methyl-ethylamino)-2-(2,3,4,5-tetrafluorobenzoyl)-ethyl acrylate, preparation of levo-oxygen main naphthenic acid, and preparation of the levofloxacin hydrochloride. The method is simple, low in production cost, high in product yield, good in product quality, economical, environmentally friendly, and low in three-waste emission load, and realizes effective separation and recycling of most byproducts, is convenient for industrial production and has great significance of promotion.

The invention discloses a communication cable sheath material, which is composed of the following raw materials in parts by weight: 50-70 parts of polypropylene, 20-30 parts of EPDM rubber, 10-20 parts of isopropanol, and methyl acetoacetate 10~15 parts, 15~25 parts of urea-formaldehyde resin, 10~25 parts of silicone resin, 20~30 parts of chlorinated polyethylene rubber, 4~8 parts of zinc stearate, 2~10 parts of calcium stearate, trioxide 4-9 parts of antimony, 1-4 parts of vaseline, 5-10 parts of magnesium oxide, 0.5-5 parts of antioxidant and 1-6 parts of anti-aging agent. The communication cable sheath material is selected reasonably, has good insulation performance, corrosion resistance, waterproof and airtight performance, and has the advantages of high transmission stability, good confidentiality, simple preparation process, low production cost, and long service life.

The invention discloses a medium-speed coal mill and a medium-speed coal milling method suitable for high-moisture lignite. The medium-speed coal mill comprises a hot air door, a milling device, a coarse powder separator, a pre-drying device and a coal feeder, wherein the outlet of the hot air door is divided into two paths, one path is communicated with the air inlet of the pre-drying device, and the other path is communicated with the air inlet of the milling device; the outlet of the coal feeder is communicated with the lignite inlet of the pre-drying device; and the outlet of the pre-drying device and an opening positioned at the bottom of the coarse powder separator are both positioned just above the milling device. The medium-speed coal mill and medium-speed coal milling method which are disclosed by the invention can complete the milling of the high-moisture lignite.

The invention provides a method for preparing high-quality levofloxacin hydrochloride, comprising 3-(2-hydroxyl-1-methyl-ethylamino)-2-(2,3,4,5-tetrafluorobenzoyl)- Preparation of ethyl acrylate, preparation of levocyclamic acid and preparation of levofloxacin hydrochloride, the method is simple, the production cost is low, the product yield is high, the quality is good, the green economy is environmentally friendly, the discharge of three wastes is small, and most of the by-products are effectively separated and recovered at the same time Utilization is convenient for industrialized production and has great popularization significance.

The invention provides an overhead transmission line fixed wing drone system selection method. The method includes the following steps: firstly determining evaluation indexes of a plurality dimensions for evaluating the system effectiveness of a fixed wing drone, and one-level or multi-level sub-indexes of the evaluation index of each dimension; then determining the value of the last-level sub-index, then on the basis of a formula, gradually computing the value of each level of sub-index except the last-level sub-index and the value of the evaluation index of each dimension; and finally, multiplying the values of the evaluation indexes of all dimensions and the result of the multiplication serving as the value of the system effectiveness, and finally carrying out system selection based on the value of the system effectiveness. According to the invention, the method, in combination with flight features of the fixed wing drones and actual conditions of a power grid routing inspection company, considers the type of the fixed wing drones from four aspects, avoids subjective factors, can assist in the system selection of transmission lines, and makes selection more scientific and reasonable.

The invention provides an environment-friendly method for preparing levofloxacin hydrochloride. The method comprises the following steps: preparing 3-(2-hydroxy-1-methyl-ethylamino)-2-(2,3,4,5-tetrafluorobenzoyl)-ethyl acrylate, preparing levo-oxy main naphthenic acid, and preparing the levofloxacin hydrochloride. The method provided by the invention is concise, low in production cost, high in product yield, good in quality, economic and environment-friendly, fewer three wastes are discharged, and most byproducts are effectively separated and recycled, so that the method is convenient for industrial production and has great popularization significance.

The invention provides a static and dynamic performance design method of a closed high-speed water lubrication dynamic pressure spiral groove thrust bearing, which comprises the following steps of establishing a closed high-speed water lubrication dynamic pressure spiral groove thrust bearing lubrication model by considering the coupling effect of multiple factors such as cavitation effect, centrifugal effect, turbulence effect, heat effect and the like, and analyzing and calculating the static and dynamic performances of the closed high-speed water lubrication dynamic pressure spiral groove thrust bearing. A static and dynamic performance design of a closed high-speed water lubrication dynamic pressure spiral groove thrust bearing is achieved, so as to obtain bearing capacity and axial rigidity as large as possible and always keep forward flow. By the adoption of the static and dynamic performance design method for the closed high-speed water lubrication dynamic pressure spiral groovethrust bearing, the static and dynamic performance design precision of the bearing can be greatly improved, the research and development period is shortened, and an effective way is provided for performance analysis and engineering design of the bearing.