35results about How to "Low raw material cost" patented technology

This invention relates to a layer-by-layer composite electrochromic thin film of Mo-WO3 and Bi-WO3 and its preparation method. The method includes: dissolving tungstic acid in hydrogen peroxide solution to obtain a peroxytungstic acid solution; adding a Bi-containing substance to the peroxytungstic acid solution and heating until the Bi-containing substance is completely dissolved to obtain a bismuth-doped peroxytungstic acid sol; adding a Mo-containing substance to the peroxytungstic acid solution and heating until the Mo-containing substance is completely dissolved to obtain a molybdenum-doped peroxytungstic acid sol; spin-coating the bismuth-doped peroxytungstic acid sol onto a conductive glass substrate and calcining to obtain a bismuth-doped WO3 thin film; and spin-coating the molybdenum-doped peroxytungstic acid sol onto the bismuth-doped WO3 thin film and calcining to obtain a Mo-WO3 / Bi-WO3 thin film. This invention employs a layer-by-layer composite structure design. The Bi-WO3 bottom layer significantly enhances the film-substrate adhesion and improves cycle stability; the Mo-WO3 surface layer ensures high optical modulation rate, fast response, and memory effect, achieving a synergistic performance improvement.

The application belongs to the technical field of stainless steel preparation, and discloses a cold-deformable and heat-treatable hardening Ni-free high-strength stainless steel and a preparation method thereof. The stainless steel comprises the following components in percentage by mass: Cr: 13-15%, C: 0.25-0.4%, Mn: 0.5-2%, Cu: 0.1-3%, Mo: 2-3%, Si: 0-0.5%, and the balance of Fe and inevitable impurities. The stainless steel does not contain Ni element, has a low work hardening rate (strain hardening index n≤0.185) and a fracture elongation rate of more than 20% in a soft state (annealed state), is cold-deformable, and has low raw material and processing costs; after quenching and aging heat treatment, the stainless steel not only has an optimal combination of strength and toughness (yield strength and tensile strength are more than 1300 MPa and 1600 MPa respectively, and elongation is greater than 10%), but also has a high yield strength ratio.

This invention discloses a carbon-sulfur battery and its preparation method. A sulfur-carbon compound containing C-S and S-S (sulfur atom number ≤ 4) structural units is used as the positive electrode active material. In-situ pre-lithiation is performed inside the battery package to prepare the positive electrode, and a carbon-based material is used as the negative electrode active material to prepare the negative electrode. The resulting carbon-sulfur battery with the above positive and negative electrode system is further assembled. This battery utilizes the lithium fusion reaction of the sulfur-carbon compound positive electrode material and the intercalation or alloying lithium fusion reaction of the carbon-based negative electrode to achieve an electrochemical redox reaction between the positive and negative electrode systems, thereby converting chemical energy into electrical energy. The sulfur-carbon compound positive electrode material exhibits high structural stability during the lithium fusion reaction. Compared to the loss of positive electrode active material caused by soluble lithium polysulfides during the discharge of elemental sulfur positive electrodes, a positive electrode with high cycle stability can be obtained. Furthermore, by utilizing the reversible lithium intercalation / deintercalation or alloying reaction of carbon-based materials to replace the unstable and highly active metallic lithium negative electrode, high cycle stability of the negative electrode can be achieved.

An air control valve for use in dental treatment equipment includes a valve seat and a core seat, with the core seat installed within a mounting hole in the valve seat. An air inlet chamber and an air outlet chamber are provided between the inner wall of the mounting hole and the outer wall of the core seat. The outer wall of the valve seat has an air inlet communicating with the air inlet chamber and an air outlet communicating with the air outlet chamber. A valve core is installed within a telescopic hole in the core seat, the telescopic hole including a blocking section, an air outlet section, and an air inlet section connected sequentially along the axial direction. The air inlet section has an air inlet port communicating with the air inlet chamber, and the air outlet section has an air outlet port communicating with the air outlet chamber. The front end of the valve core extends out of the valve seat through a through-hole. This separate structure combining the valve seat and core seat allows the valve seat to be injection molded or cast from low-cost materials, reducing the amount of brass used. Furthermore, since the valve seat is injection molded or cast, complex precision machining is unnecessary, improving production efficiency and achieving the goal of reducing raw material and manufacturing costs, effectively meeting the needs of large-scale production.

The invention discloses conductive copper paste and a preparation method thereof, and belongs to the technical field of photovoltaic materials. The conductive copper paste takes base metal copper instead of noble metal silver as a core conductive component, and solves the problem of high cost of the existing conductive silver paste. The copper paste comprises the following components in percentage by weight: 72-85% of copper powder, 2.5-8% of glass powder, 8-12% of an organic carrier and 1-9% of an additive, the copper powder is spherical powder with D50: 0.5-5 [mu] m, preferably 1-2 [mu] m; the glass powder is prepared from at least two components such as PbO and SiO2 through a specific process, and the additive comprises an organic antioxidant and an inorganic antioxidant, so that a dual antioxidant system is formed. The special low-temperature glass powder is used for reducing the sintering temperature and blocking diffusion of copper ions, the copper paste is sintered at the high temperature of 500-600 DEG C in the air without inert gas protection in cooperation with a dual-oxidation-resistant scheme, the photoelectric conversion efficiency of the prepared solar cell reaches 26.586% to the maximum and is equal to that of commercially available silver paste, the raw material cost is only 1 / 100 of that of the silver paste, and the application range is wide. And the method adapts to the existing silicon-based battery process, and can realize commercialized large-scale mass production.

This invention discloses an internally threaded steel pipe, its processing technology, and processing device. The internally threaded steel pipe includes a stainless steel inner tube (1), which is formed by rolling stainless steel strip. The inner wall of the stainless steel inner tube (1) is provided with thread teeth (2). The number of thread teeth (2) is multiple and they are distributed in a ring along the inner wall of the stainless steel inner tube (1). A thread groove is formed between adjacent thread teeth (2). This invention can reduce the production cost of internally threaded pipes for air conditioners and improve their service life.

This invention discloses a method and application for treating moldy corn to synthesize polyhydroxy fatty acids (PHA) using a compound enzyme preparation, relating to the fields of fermentation engineering and waste resource utilization technology. The method for treating moldy corn to synthesize PHA using a compound enzyme preparation includes the following steps: 1) screening and culturing highly efficient halophilic bacteria as inoculum strains for open-enzyme PHA synthesis; 2) pretreating moldy corn with a compound enzyme preparation composed of α-amylase, β-amylase, and glucoamylase; 3) using the moldy corn hydrolysate as a fermentation carbon source, inoculating with PHA-producing halophilic bacteria for open-enzyme fermentation. This invention constructs a complete process system of specific halophilic bacteria screening – moldy corn enzymatic pretreatment – ​​open-enzyme fermentation to synthesize PHA, realizing the resource utilization and high-value utilization of moldy corn. Compared with existing technologies, it has significant economic, environmental, and industrial value, with outstanding comprehensive beneficial effects.

The invention discloses a method for preparing hectorite nano-powder through in-situ stripping of a synthetic hectorite reaction liquid, and belongs to the technical field of nano-powder preparation. The method aims at solving the problems that in the prior art, the technological process for preparing hectorite nanosheets is complex, the stripping efficiency is low, the product uniformity is poor, and continuous production is difficult. According to the technical scheme, the preparation method comprises the following steps: after a hydrothermal synthesis reaction of hectorite is completed, naturally cooling a reaction solution, and aging at room temperature for 24 hours; diluting with water until the mass concentration of hectorite is 1-10wt%; the diluent is directly subjected to high-pressure homogenization treatment under the pressure of 10-100 MPa without drying, and interlayer in-situ efficient stripping is achieved through generated shearing, impacting and cavitation effects; then carrying out filter pressing and washing on the homogenized liquid until the conductivity of the discharged liquid is lower than 5S / cm; and finally, strongly drying under the conditions that the temperature is 90-130 DEG C and the grading frequency is 5-25 Hz, so as to obtain the delaminated hectorite nano powder with the water content of less than or equal to 2.0%. Through an integrated strategy of synthesis, in-situ stripping and continuous treatment, the traditional drying and re-dispersing steps are omitted, the technological process is remarkably simplified, the energy consumption is reduced, and the stripping effect is remarkable.

The application relates to a chiral triazole-oxazoline compound and a preparation method and application thereof, and belongs to the technical field of organic synthesis. The chiral triazole-oxazoline compound has the structural formula: the preparation method comprises the steps of click reaction, triazole N2 substitution reaction, Suzuki coupling, triazole ester hydrolysis, amidation with a chiral amine alcohol and dehydration condensation. After a chiral triazole-oxazoline compound and a palladium salt compound are added to generate a catalyst in situ, asymmetric addition of aryl boronic acid on a carbon-carbon double bond of a prochiral organic compound is carried out to prepare a chiral organic compound. The application has the advantages of low raw material cost, few synthesis steps, low experiment site requirement, relatively mild reaction conditions and simple operation for preparing the novel triazole-oxazoline compound.

The utility model belongs to the technical field of shoes, and particularly relates to a kraft paper woven breathable shoe which comprises a sole, an upper and a toe cap, the outer surface of the upper is covered with a first breathable layer, the first breathable layer comprises a plurality of crisscrossed kraft paper belts, and first breathable holes are formed among the four crossed kraft paper belts. The inner end of the toe cap extends inwards to be provided with a shoe tongue, the outer surface of the toe cap is covered with a second breathable layer, and the outer surface of the shoe tongue is covered with a third breathable layer. The breathable layer is formed by weaving a plurality of crisscrossed kraft paper belts, the breathable holes are formed by four strands of crossed kraft paper belts, then the breathable performance of the shoe is achieved, compared with the prior art, the breathable layer is formed by weaving degradable and recyclable kraft paper, the raw material cost of the breathable layer is reduced, more consumer requirements can be met, and the breathable performance of the shoe is improved. On the other hand, waste kraft paper can be reutilized, and the environment-friendly concept of sustainable development is met.

The invention relates to a method for reinforcing the performance of an LPBF formed SiCp / Al composite material based on TiB2 in-situ modification. The defects that an existing LPBF formed SiCp / Al composite material is serious in interface harmful reaction, weak in binding force, coarse in grain and poor in material plasticity are overcome. The method comprises the following steps: pre-oxidizing SiCp; mechanically mixing the powder; and carrying out LPBF forming. According to the method, after SiCp is pre-oxidized, TiB2 is added, so that generation of harmful phases between SiCp and an Al matrix is effectively avoided, the bonding strength of SiCp and the Al matrix is improved, meanwhile, TiB2 serves as a heterogeneous nucleation mass point to achieve various strengthening synergistic effects such as fine grain strengthening and dispersion strengthening on the composite material, and joint improvement of the mechanical property and plasticity of the LPBF formed SiCp / Al-based composite material is completely achieved.

The application discloses a preparation method of single-crystal dimanganese trioxide, a lithium manganate positive electrode material and a lithium battery, and belongs to the technical field of lithium batteries. 2+ Excessive oxidation is inhibited by controlling the content of reducing substances through the addition of a reducing additive 3+ , combined with the control of solid content, the adjustment of multi-stage pH value and the aging process, to obtain single-crystal dimanganese trioxide with high purity and regular hexahedron morphology. The lithium manganate positive electrode material is prepared by calcining the single-crystal dimanganese trioxide and lithium carbonate according to a Li / Mn molar ratio of 0.55:1. The application has the advantages of mild process, cheap raw materials, easy industrialization, adaptation to the demand of high-performance lithium batteries, and solution to the problems of low purity, irregular morphology, high energy consumption and insufficient electrochemical performance in the traditional method.

The application discloses a kind of sodium iron silicate negative materials and preparation method thereof.The method uses phosphating by-product silicon slag as silicon source, uses iron salt and sodium salt as raw material, uses template agent and solvent as auxiliary, and obtains the irregular spherical particle sodium iron silicate negative material by sol-gel method combined with stepwise heating calcination process.The application realizes high-value utilization of phosphating solid waste, and the prepared material has stable structure and exhibits high reversible capacity and excellent cycle stability when used as sodium-ion battery negative material.The method is simple, green and environmentally friendly, and low in cost, suitable for industrial production.

This solution provides a design method and electronic device for composite resistive pastes with target resistance values. It uses the resistance parameter sets and mixing ratios of each composite resistive paste and corresponding first and second resistive pastes as training data sets. The training data sets and parameter acquisition instructions are input into a regression prediction model for training, outputting optimized resistance parameters and the optimal number of regression equation terms. The target resistance value of the composite resistive paste and the optimized resistance parameters of the first and second resistive pastes are used as prediction parameter sets. The prediction parameter sets and prediction instructions are input into the trained regression prediction model, outputting the predicted mixing ratio of the first and second resistive pastes, thereby achieving efficient design of composite resistive pastes with target resistance values.

This invention relates to the field of electrochemical energy storage technology, and in particular to a novel high-entropy electrolyte based on a eutectic solvent and its application in electrochemical devices such as low-temperature secondary batteries and supercapacitors. The eutectic solvent high-entropy electrolyte of this invention is composed of at least five eutectic solvents; each eutectic solvent consists of a hydrogen bond acceptor and a hydrogen bond donor; the hydrogen bond acceptor is one of choline chloride, tetraethylammonium chloride, tetrabutylammonium chloride, zinc chloride, magnesium chloride, lithium perchlorate, and water; the hydrogen bond donor is one of urea, citric acid, lactic acid, acrylic acid, itaconic acid, formic acid, ethylene glycol, glycerol, acetamide, formamide, and water. The eutectic solvent high-entropy electrolyte of this invention not only lowers the liquid-solid transition temperature of the electrolyte, achieving better low-temperature performance, but also has the advantages of low raw material cost and environmental friendliness.

The invention relates to the technical field of fireproof sound-absorbing boards, and discloses a fireproof sound-absorbing board which comprises a porous decorative surface layer, a first inorganic fiber layer, a sound-absorbing base board layer, a second inorganic fiber layer and a back board layer which are sequentially stacked from top to bottom. The sound-absorbing base plate layer is prepared by mixing, foaming, curing and molding plant fibers, an inorganic cementing material, a foaming agent and a functional additive; according to the scheme, plant fibers and inorganic cementing materials which are wide in source are selected as raw materials, high-price polyurethane is replaced, the process is simple, the cost is greatly reduced, and large-scale popularization is facilitated. All the components are environmentally friendly and harmless, no toxic gas is released, the inorganic fiber layer is firmly bonded, the drifting risk is avoided, and human health is guaranteed. Renewable materials are used as raw materials, production energy consumption is low, the green and low-carbon concept is met, the special structure of the base plate layer and the double-layer inorganic fiber layer cooperate for sound absorption, the effect is far better than that of a mineral wool board, and the problem of defects in the prior art is solved.

This invention discloses a phosphorus slag-based cementitious material, its preparation method, and its application, specifically relating to the field of cementitious materials technology. The cementitious material, by weight, comprises the following components: 60-90 parts phosphorus slag powder; 5-25 parts fly ash; 5-15 parts activator; 0.25-1.5 parts early-strength agent; and 0.2-0.5 parts water-reducing agent; wherein the specific surface area of ​​the phosphorus slag powder is 400-550 m². 2 / kg, particle size (D) 90 The particle size is 20-40 μm; the early-strength agent is selected from at least one of iron salts and aluminum salts. This invention uses phosphorus slag micro-powder with a specific specific surface area as the main substrate, with a high dosage, combined with fly ash, activator, early-strength agent, and water-reducing agent to obtain phosphorus slag-based cementitious materials. By optimizing the physical properties of the phosphorus slag micro-powder and constructing a suitable composite activator-early-strength system, the 28-day compressive strength of the cementitious material reaches over 61.0 MPa, achieving a balance between "high phosphorus slag content" and "high strength".

The invention discloses a foundation pit supporting passive area soil body reinforcing structure and a construction method thereof. The structure comprises fender posts arranged along the periphery of a foundation pit; the cement soil reinforcement area is located in the passive area soil body behind the fender posts, and the cement soil reinforcement area is formed by meshing a plurality of cement mixing piles; the high-pressure jet grouting pile reinforcing band is arranged between the fender post and the cement soil reinforcing area, and the high-pressure jet grouting pile reinforcing band fills a gap between the fender post and the cement soil reinforcing area, so that the fender post, the high-pressure jet grouting pile reinforcing band and the cement soil reinforcing area are in close contact, and a continuous force transmission system is formed. The gaps between the fender posts and the cement mixing piles are filled with the high-pressure jet grouting piles, force transmission is smooth, the passive area soil reinforcement effect is greatly improved, fender post deformation is effectively controlled, and the safety and stability of a foundation pit are guaranteed.

This invention discloses a diesel engine catalyst based on high-entropy oxides and modified adsorbents, and its preparation method. The catalyst uses PtCeFeMnCoO5 high-entropy oxide nanoparticles as the main catalytic active component, supplemented by Cu-Fe modified hydrotalcite-derived composite oxides, CeO2, ZrO2, γ-Al2O3, and cordierite honeycomb ceramic support. The PtCeFeMnCoO5 high-entropy oxide nanoparticles, as the main catalytic active component, possess advantages such as sulfur resistance, heat resistance, and low cost. The internal five-membered metal oxides synergistically enhance the catalyst's catalytic activity and extend the high-activity temperature window. The pre-adsorption and subsequent gelation preparation method based on a carbon black adsorption matrix significantly improves the dispersion effect of the five-membered high-entropy oxide precursor, increases the number of adsorption / catalytic active sites of the five-membered high-entropy oxide, enhances the overall NOx purification performance of the LNT catalyst, and achieves precious metal reduction. The modified hydrotalcite-derived composite oxides replace the Al2O3 coating additive, significantly improving the NOx adsorption capacity of the LNT catalyst.

The invention discloses a forming method of a high-rib arc die forging, and belongs to the technical field of forging. The method comprises the steps that S1, a final forge piece is designed, specifically, ribs of a part are divided into 10 equal parts according to the height, four draft sections are divided from the rib top to the rib root according to the proportion of 1: 2: 3: 4, draft angles of 5-7 degrees, 7-10 degrees, 10-15 degrees and 15-20 degrees are sequentially set, transition fillets between the draft sections are R300-R800, meanwhile, bosses are arranged at the tops of the ribs, and the four corners of a rib plate are wrapped with cylinders; s2, die design is conducted, specifically, a second forming cavity for forming high ribs is formed in a lower die, and an air storage tank and a bridge part are arranged; s3, a rough blank is designed, the size of the rough blank is 1.1-1.2 times that of a final forging, and a positioning face is set; s4, finish forging forming is conducted, and variable-speed pressing is adopted; and S5, machining to obtain the part. According to the method, the rib part is sectionally provided with different draft angles, and optimized transition fillets are supplemented, so that the metal flow resistance is effectively reduced, complete filling of the high rib part is ensured, the defect of insufficient filling is avoided, meanwhile, the bottom deformation amount is increased, and a forge piece deformation dead zone is prevented from being formed.

This invention provides a method for regenerating and reusing copper nitrate stripping wastewater. The method includes the following steps: providing copper nitrate stripping wastewater; mixing the wastewater with additives and electrolyzing it to obtain metallic copper and an electrolyzed solution; the additives include sulfamic acid and urea; and replenishing the electrolyzed solution with acid to obtain a regenerated copper nitrate stripping solution. This invention adds sulfamic acid and urea, which are well-compatible with the copper nitrate stripping wastewater, as additives. Through their synergistic effect, the efficiency of copper extraction via electrolysis is significantly improved, achieving high-efficiency and high-value copper recovery, and increasing the acidity of the electrolyzed solution. Furthermore, only a small amount of acid replenishment is needed to restore the copper stripping capacity, greatly reducing acid consumption and achieving low-cost recycling. This method is simple, has a high resource recovery rate, and can effectively reduce the raw material and environmental costs of the copper stripping process, offering both economic and environmental benefits.

The invention discloses a tungsten sulfide / carbon composite negative electrode material and a preparation method and application thereof, and belongs to the technical field of sodium ion battery negative electrode materials. The preparation method comprises the following steps: taking bagasse as a raw material, preparing a spherical carbon material through pretreatment, acidic hydrothermal treatment and high-temperature calcination, coating polyaniline through in-situ chemical oxidation polymerization, and then carrying out secondary polymerization and calcination to obtain a carbon matrix CNS (at) PAN (at) CS; and then carrying out hydrothermal reaction and high-temperature calcination on the carbon substrate, a tungsten source and a sulfur source, and growing WS2 nanosheets on the surface of the carbon substrate in situ to form a multi-dimensional network structure. The method is simple in process, low in cost and environment-friendly, provides a new method for large-scale application of the sodium ion battery, and has a good application prospect.

The invention discloses a degradable rubber composition and a preparation process thereof, and belongs to the technical field of rubber materials. The degradable rubber composition comprises 100 parts of emulsion polymerized styrene-butadiene rubber, 20-50 parts of a chemical crosslinking integrated composite filler, 2-4 parts of a vulcanization system, 6-8 parts of an activator and 1-2 parts of an anti-aging agent. The core-shell structure chemical crosslinking integrated composite filler constructed by directional covalent bonds is designed and adopted, amination modified corn-based charcoal is used as a rigid nuclear phase, mixed raw powder of soybean defatted raw powder and corn bran raw powder is used as a flexible shell phase, and the amination modified corn-based charcoal and the mixed raw powder form a stable integrated structure through an epoxy crosslinking agent. The composition disclosed by the invention can replace petroleum-based carbon black in a high proportion, has excellent mechanical properties, processability and degradability, and solves the industrial pain points of poor compatibility, insufficient reinforcement and water absorption degradation of the existing biomass filler; the preparation process is compatible with the existing rubber industrial production line, green, low in cost and suitable for large-scale popularization.

The utility model relates to the technical field of manufacturing of petroleum drilling and production equipment, and discloses a shaft seat device for a pumping unit, which comprises shaft seat bodies, a bottom plate and a welding part for flatly placing the bottom plate to facilitate welding, the bottom plate is fixedly mounted on the top side of the welding part through a fastener, the shaft seat bodies are symmetrically and vertically erected on the top side of the bottom plate, and the shaft seat bodies are fixedly mounted on the bottom plate. The shaft seat body is fixedly welded to the top side of the bottom plate, and a hollow groove is formed in the center of the bottom plate. By welding and correcting a deformed welding piece, the machined upper panel meets the requirement for flatness required by the bottom face of a bottom plate in a shaft seat assembly drawing, and bolt holes connected with the bottom plate of the shaft seat assembly are drilled in the machined upper panel and used for connecting the bottom plate and the upper panel before welding of the shaft seat assembly of the oil pumping unit. In this way, the problem that the flatness of the bottom face of the oil pumping unit shaft seat assembly cannot be guaranteed after welding due to welding deformation caused by welding of the shaft seat on the upper panel in the manufacturing process of the oil pumping unit shaft seat assembly can be effectively solved.

The utility model relates to a waste heat boiler header turnover frame, and belongs to the technical field of boiler equipment. The container storage rack is used for storing and transferring containers and comprises a single-layer support with an open upper portion, the single-layer support comprises a rectangular bottom frame capable of containing the containers and four stand columns fixed to the four corners of the rectangular bottom frame respectively, lifting lugs are arranged on the upper end face of the rectangular bottom frame, and inserting grooves are formed in the lower end face of the rectangular bottom frame. And the upper-layer single-layer bracket can be spliced with the upright posts of the lower-layer single-layer bracket through the slots. According to the utility model, the space utilization rate of a storage site is obviously improved, the transfer efficiency of the container is improved, and the container has the advantages of lower raw material and processing and manufacturing cost, safety and reliability.

The present application relates to a kind of adjustable diameter reamer device and cutting equipment, including reamer unit, it includes tool disc, reamer blade and adjusting assembly, reamer blade is detachably assembled in tool disc;Adjusting assembly includes adjusting expansion pin and first connecting piece, adjusting expansion pin includes base, connecting column and first threaded hole, base is coaxially connected with connecting column, first threaded hole is arranged through base and connecting column, base has first end and second end along the axial direction, the diameter of first end is less than the diameter of second end, and first end is connected with connecting column;Second threaded hole and first positioning hole are provided in tool disc, the pitch of first threaded hole is less than the pitch of second threaded hole, and first threaded hole and second threaded hole are connected by first connecting piece.The present application can realize the micro-adjustment of tool disc diameter, meet the machining precision requirement of IT6 level in lathe machining, using independent modular tool disc structure, it is beneficial to carry out quick changeover, without repeated purchase connecting rod and tool handle, effectively reduce use cost.

This invention relates to a pressure-sensitive carbon-coated current collector, its preparation method, and a lithium-ion battery. The pressure-sensitive carbon-coated current collector includes a current collector foil and a conductive carbon layer located on at least one side of the current collector foil. The conductive carbon layer includes a pressure-sensitive binder, a first conductive carbon and a second conductive carbon with different particle sizes, and a dispersant. The conductive carbon layer of this invention, comprising a pressure-sensitive binder, a first conductive carbon, a second conductive carbon, and a dispersant, combines the pressure-sensitive binder with the first and second conductive carbons of different particle sizes. Under room temperature and rolling conditions, this significantly improves the adhesion between the dry electrode layer / electrode slurry coating and the current collector, achieving a tighter conductive contact between the current collector and the electrode layer. This is particularly suitable for preparing battery electrodes using dry processes. Electrodes prepared using the pressure-sensitive carbon-coated current collector can maintain a tight and durable conductive contact and stable electrochemical performance even after repeated electrochemical cycles.

The invention relates to the technical field of miniature electronic equipment, and discloses a low-cost composite vibrator and a linear vibration motor, and the low-cost composite vibrator comprises a high-density core which is made of tungsten or tungsten alloy and is flat, and the middle part of the high-density core is provided with a through square hole for accommodating magnetic steel; the metal shell is made of steel formed through punching, is of a cover-shaped structure with an opening in the top and is used for wrapping and fixing the high-density core; the high-density core is embedded into the containing cavity of the metal shell, and the high-density core and the metal shell are fixedly connected along the joint edge through laser welding to form the whole composite oscillator. By elaborately designing the sizes and the wall thicknesses of inner and outer parts, the total mass and the gravity center position of the composite oscillator are equivalent to those of an all-tungsten oscillator; therefore, the vibration performance and the start / stop characteristic of the linear motor are not negatively influenced.

This invention discloses a solar cell and its fabrication method, components, and system. The solar cell includes a silicon substrate, a doped layer and a passivation layer sequentially stacked on the back side of the silicon substrate. The passivation layer has electrode trenches that locally expose the doped layer, and the electrode trenches are provided with a back electrode. The back electrode includes a seed metal silicide layer, a seed metal oxide thin layer, a mixed conductive layer, and an outer metal layer sequentially stacked on the back side of the locally exposed doped layer. The seed metal silicide layer is one or more layers selected from molybdenum silicide, nickel silicide, and titanium silicide layers; the seed metal oxide thin layer is one or more layers selected from molybdenum oxide, nickel oxide, and titanium oxide thin layers; and the thickness of the seed metal oxide thin layer is no greater than 20 nm. This solar cell has a novel electrode structure, which can promote improvements in electrode structure and performance, and reduce costs. The novel electrode structure of this solar cell exhibits good current transport performance and low metal recombination loss.

The application belongs to the field of pharmaceutical chemical industry, and particularly relates to a production method of a key intermediate of alamorelin, i.e. trimethylhydrazine hydrochloride. The technical scheme of the application comprises the following steps: step 1. synthesis of compound 2 is divided into two stages: stage 1. under the action of an alkali, hydrazine formic acid tert-butyl ester is reacted with a methylating agent to generate a mixture of compound 3 and compound 2. The mixture does not need to be further purified and separated, and is directly used in the second stage; stage 2. the mixture in the above step is further reacted with the methylating agent to be completely converted into compound 2, and step 2. compound 2 is removed from Boc protection in the presence of hydrochloric acid, and is salified to obtain trimethylhydrazine hydrochloride. The application provides a preparation method of trimethylhydrazine hydrochloride suitable for industrial production, and solves the problems of high production cost and safety hazards existing in the prior art.