136results about How to "Multiple contact areas" patented technology

The invention belongs to the technical field of gas sensors, and particularly relates to a mixed-potential nitrogen dioxide sensor with an efficient three-phase interface based on a porous YSZ (yttria stabilization zirconia) substrate and a preparation method for the sensor. The sensor is mainly used for detecting automobile exhaust, and sequentially comprises an Al2O3 ceramic plate, the porous YSZ substrate, a Pt (platinum) reference electrode and an MnCr2O4 sensitive electrode, wherein the Al2O3 ceramic plate is provided with a Pt heating electrode, one side of the porous YSZ substrate is provided with a pore-forming surface, both the reference electrode and the sensitive electrode are bar-shaped and symmetrically positioned at two ends of the pore-forming surface of the porous YSZ substrate close to a boundary, the porous YSZ substrate is provided with a planar double-layer structure, the surface of the porous YSZ substrate is rough and porous, and the porous YSZ substrate is prepared by casting YSZ slurry added with pore-forming agent starch on a YSZ cast biscuit after low-temperature degreasing and high-temperature sintering. By using MnCr2O4 as the sensitive electrode and adding the three-phase interface of the mixed-potential NO2 sensor, sensitivity of the sensor is enhanced.

The invention discloses a disposable controlled completely-degradable plastic packing bag, which is formed through melting, blending, extruding and film-blowing of components comprising in parts by weight: 20 to 45 parts of polyvinyl alcohol, 72 to 87 parts of starch, 10 to 20 parts of micromolecule plasticizer, 0.2 to 2 parts of modified inorganic nanometer additive, 0.1 to 1.5 parts of antioxidant, 0.5 to 3 parts of compatibilizer, 8 to 15 parts of inorganic filler, 0.1 to 1 part of ultraviolet absorber, and 0.1 to 1 part of pigment. The invention further discloses a preparation method of the plastic packing bag. The nanometer composite modifier in the packing bag adopts a micromolecule plasticizer easy to form a hydrogen bond with the starch, a certain amount of inorganic nanometer additives subject to surface treatment are added in the packing bag, so that after PVA (polyvinyl acetate) is modified by the nanometer composite modifier, the use amount of the molecule plasticizers is reduced greatly, the cost is lowed, the reduction of the mechanical property of a film is avoided, and the controlled completely-degradable film with excellent mechanical property and the use performance can be obtained.

The invention discloses an intelligent preparation system and preparation method for synthesizing a quick-acting and slow-release integrated efficient ecological compound fertilizer through straw microbial fermentation. The system comprises a cutting unit, a fermentation unit, an intelligent control unit, a waste heat recovery unit, a press filtration unit, a grinding and crushing unit, a blending unit, a granulation and drying unit and a finished product sub-packaging unit, wherein the fermentation unit comprises a fermentation tank, a biogas recovery mechanism, a heating mechanism, a heat exchange mechanism, a sprinkling mechanism, an automatic feeding mechanism and a stirring mechanism. The method comprises the following steps: performing sealed fermentation on straws and animal feces; and performing water press filtration on a fermentation product, then performing high-temperature inactivation, adding an appropriate amount of inorganic quick-acting fertilizer and trace element fertilizer, rooting powder, a drought-resistant water retention agent and clay, mixing, and performing granulation and drying to obtain the compound fertilizer. By adopting the system and the method disclosed by the invention, fresh animal feces are used as a leaven which contains a lot of microorganism bacteria and digestive enzymes and can promote biological degradation and decomposition of the straws; and moreover, the animal feces are further fermented to be beneficial for opening unstable ester bonds in straw cellulose, accelerating the degradation of the straws and shortening the fermentation period.

The invention discloses a table panel which comprises an upper panel, a lower bottom plate and at least a pair of embedded pieces, wherein the upper panel is provided with a smooth external surface; the lower bottom plate is provided with a plurality of pits; the pits are arrayed on the lower bottom plate in a staggered manner; the top surfaces of the pits are propped against the internal surface of the upper panel; and the embedded pieces are arranged on the two opposite sides between the upper panel and the lower bottom plate. The top surfaces and side walls of the pits can bear pressure from the upper panel, so that the compressive capacity of the upper panel is improved, and the higher strength of the table panel even with less thickness can be ensured. Particularly, the total area of the pits account for 30-70% of the area of the lower bottom plate, the contact area of the top surfaces of the pits with the internal surface of the upper panel is larger, and the strength of the table panel is further improved. Particularly, when the area of the single pit is 1-15cm<2>, the number of the pits is increased, that is, the area of the top surfaces and the side walls of the pits is increased, and the strength of the table panel is greatly improved.

The invention relates to the technical field of battery materials, in particular to a sulfur/vanadium disulfide/MXene composite material as well as a preparation method and application thereof. According to the preparation method disclosed by the invention, the sulfur loading capacity can be improved due to the high specific surface area and a large number of active sites of the sulfur loading material MXene; MXene has unique flexibility and conductivity, so that the volume change of the positive electrode material can be buffered, and the conductivity of the composite material can be improved; the surface of the MXene is provided with a large number of functional groups and static electricity, so that vanadate ions can be attracted to generate a coordination effect; the vanadate ions areuniformly adsorbed on the surface of the MXene, so that the vanadate ions and a sulfur source generate uniform vanadium disulfide nanosheets on the surface of the MXene in situ at a proper temperature; by introducing the vanadium disulfide nanosheet with catalytic activity and high conductivity into MXene, lithium polysulfide can be chemically adsorbed, and the vanadium disulfide nanosheet can bequickly catalyzed and converted into insoluble Li2S2/Li2S in an electrolyte, so that a serious shuttle effect is inhibited, the stability of the lithium-sulfur battery is improved, and the cycle lifeof the lithium-sulfur battery is prolonged.

The invention relates to a metal conductive agent and a lithium ion battery using the conductive agent. The metal conductive agent is made of metal which has stable properties under a negative pole potential, such as silver, copper, nickel, stainless steel, nickel-plated silver or nickel-plated copper; and the metal conductive agent has a powder shape or spring shape or hollow semispherical shape or other hollow shapes. In a negative pole, the hollow metal conductive agent is used; by controlling the compaction density of a pole piece, the conductive agent keeps a certain hollow structure after being ground; when a silicon-containing negative pole is charged and expanded, the metal conductive agent is deformed along the expansion direction of negative pole particles to form a certain space, so that the staggering and stripping of the negative pole particles are inhibited to a certain extent; and meanwhile, the contact area of metal and the negative pole particles keeps unchanged or is relatively large when the negative pole particles are extruded and enough conductivity is kept, so that the cycling service life is maintained.

The invention discloses a roll type vertical mill which comprises mill shell. A grinding disc and grinding rolls are arranged in the mill shell. A nozzle ring is arranged between the outer circumference of the grinding disc and the mill shell. An air inlet is further arranged at the position, on the lower portion of the nozzle ring, of the mill shell. Air enters the air inlet to enter the mill shell to form annular airflow. A material blocking ring is arranged on the edge of the grinding disc and is circumferentially and evenly provided with material stirring plates. Louver air guide blades are annularly and evenly distributed in the nozzle ring. Annularly-distributed impact plates are arranged on the upper portions of the louver air guide blades. A discharging opening used for dischargingis further connected to the bottom of the shell. Annularly-distributed vortex plates are arranged on the inner wall of the middle upper portion of the mill shell, tangential air inlets are arranged at the positions of the mill shell, and air is supplied to the tangential air inlets through an air supplementary annular air flue. According to the roll type vertical mill, the air volume of lifting materials on the nozzle ring can be balanced and adjusted, the material grading efficiency of the nozzle ring can be improved, the air volume of the airflow of the lifting materials can be reduced, thepressure difference can be reduced, energy can be saved, and meanwhile the powder selection efficiency can be improved.

The invention relates to the technical field of anticorrosive coatings, and in particular, relates to a thin-coating heavy-duty anticorrosive coating and a preparation method thereof. The thin-coatingheavy-duty anticorrosive coating comprises the following raw materials in parts by mass: composite resin, a dispersing agent, a defoaming agent, a thixotropic agent, glass flakes, modified graphene slurry, a special functional filler, a filler, a solvent and a composite curing agent. With adopting of the thin-coating type heavy-duty anticorrosive coating provided by the invention, the problems ofslow paint film drying time, long construction period, insufficient flexibility, coating layer failure such as easiness in cracking and peeling and like due to the high-film-thickness design of a conventional heavy-duty anticorrosive coating are solved, the coating is applied to long-acting heavy-duty corrosion prevention of steel structures and concrete engineering in a marine environment, improves the paint film defect of high-film-thickness design of the conventional heavy-duty anticorrosive coating, greatly reduces the construction cost and the construction progress, reduces the use amount of the coating and reduces the emission of volatile organic compounds. The production process is simple, the processing cost is low, and large-scale commercial production is easy.

The invention discloses an oil screen used for a range hood. The oil screen comprises a frame and multiple blades arranged in the frame. Each blade is arranged in the width direction of the frame. All the blades are arranged in parallel in the length direction of the frame to form a grating shape. The oil screen is characterized in that the blades include at least two first blades located in the middle and at least two second blades located on the two sides of the first blades; and the air inlet area, at the positions of the second blades, of the oil screen is larger than the air inlet area, at the positions of the first blades, of the oil screen. The invention further discloses the range hood applying the oil screen. The blades of the type are arranged, the angle of the blades on the two sides is large, the angle of the blades in the middle is small, the interval of the blades on the two sides is large, the interval of the blades in the middle is small, and therefore the negative pressure moves towards the two sides, and the lampblack suction effect is improved.

The invention relates to a method for dating the isotope of limestone Re-Os, and belongs to the technical field of isotope geochronology. The problems that the sampling method is unscientific, the dating samples are blindly selected, the success rate of dating is low, the sample digestion is incomplete and takes a long time, and the impurity interference caused by a dissolution scheme causes the poor accuracy and precision of the limestone Re-Os isotope age results. The method comprises the following steps: collecting a limestone sample and crushing the sample; selecting a limestone dating sample deposited in a reducing environment; pre-digesting the limestone dating sample, and dissolving a pre-digesting solution of the limestone dating sample with a mixed solution of hydrochloric acid and hydrogen peroxide; separating and purifying a dissolution solution Re-Os of the limestone dating sample; performing the Re-Os isotope thermal ionization mass spectrometry; processing the Re-Os isotope data to obtain the final limestone Re-Os isotopic age. The analysis method provided by the invention has the advantages of improving the success rate, accuracy, precision and the operation efficiency of the experimental process of the limestone Re-Os isotope dating.

The invention relates to a deep foundation pit structure above a subway tunnel and a construction method thereof, and relates to the technical filed of deep foundation pits. The deep foundation pit structure comprises a soil layer and a subway tunnel arranged in the soil layer, a pile foundation is arranged in the soil layer, an underpinning beam is poured at the upper end of the pile foundation,a raft is arranged on the underpinning beam, and a shockproof and water proof layer is arranged on the lower plane of the raft. Retaining walls are arranged on the deep foundation pit structure, the inner side walls of the retaining walls abut against the raft, and supporting beams are arranged between the inner side walls. A plurality of separation plates which are distributed in the length direction of the supporting beams are arranged on the raft, each separation plate is located between the two retaining walls which are symmetrical to each other, each separation plate is vertically arranged and perpendicular to the supporting beams, supporting rods are correspondingly divided into a plurality of outer supporting rods, and two ends of each outer supporting rod are correspondingly connected with the corresponding retaining walls or the separation plates. The deep foundation pit structure has the effect of improving the stability of the supporting beams.

The invention discloses an efficient planting method for a selenium-enriched passion fruit. The efficient planting method includes the following steps of (1) cutting seedling, wherein two-year thick and strong branches with the diameter of 1-2 cm are selected from February to March, grooves with the depth accounting for 2/3 of the branch diameter are dug at the position 2 cm below the two joints away from the terminal buds and smeared with a rooting medium, the grooves are tightly wrapped by a soil layer with the thickness of 5-7 cm, the branches continue to grow for 6-8 days, the portions from the terminal buds to the positions located below the grooves by 3 cm are cut, and cuttage is carried out in soil to develop passion fruit seedlings; (2) fertilization management, wherein selenium-enriched liquid fertilizer is applied at the interval of 10 days, 100-200 g of the liquid fertilizer is applied to each plant, and an active substance is sprayed to the passion fruit seedlings 1-2 h before spraying the selenium-enriched liquid fertilizer; (3) pruning management is carried out. The survival rate of the passion fruit seedlings can be increased by adopting the planting method, the yield of the passion fruit and the selenium content in the passion fruit are increased, and the efficient planting method has huge market promotional value.

The invention provides a preparation method of a palladium-charcoal catalyst and further provides the palladium-charcoal catalyst prepared by using the preparation method and application of the palladium-charcoal catalyst. Compared with the prior art, palladium ions which are already adsorbed to a carrier are subjected to in-situ reduction through electrochemical in-situ reduction; compared with aconventional method that a reducing agent is added or electrochemical deposition is implemented, the preparation method is rapid in reduction speed, and the metal palladium takes the shape of sheetsand has a large contact area with the carrier, so that migration and dropping of the palladium metal can be well prevented, and the catalyst is high in stability, high in palladium atom utilization rate and good in catalysis performance; and meanwhile, a high conversion rate and yield can be achieved without adding other metals into the catalyst, and problems of separation and palladium metal recycling caused by conventional preparation methods can be solved.

The invention relates to a distributed optical fiber sensor. A substrate of the optical fiber sensor is made of a metal material and is of a sheet band shape; grooves are formed on the surface of the sheet band-shaped substrate; sensing optical fibers are put into the grooves; hollow holes are formed in the metal sheet band; the hollow holes are of different specifications; and hollow stripes vertical to groove lines are formed on the grooves. The sensor is surface-mounted; due to the sheet band-shaped structure, the sensor and an object to be sensed have enough contact areas; by virtue of the small hollow holes, the deformation modulus of the sensor can be reduced further; the grooves are used for wedging and protecting the sensing optical fibers; and the hollow stripes vertical to the groove lines are favorable for curved surface sticking. The distributed optical fiber sensor has the characteristics of high coupling property, high sensitivity, convenience in installation, distributed monitoring and the like.

The invention provides a cathode catalyst for hollow nano water electrolysis, and a preparation method thereof. The method comprises the following steps: 1, adding potassium ferricyanide into a mixedsolution of a cobalt salt and sodium citrate according to the molar ratio of the cobalt salt to the potassium ferricyanide of (0.1-1): (0.2-0.5), then standing still, separating an obtained product, and sequentially washing and drying to obtain a prussian blue-like compound; and 2, carrying out annealing treatment on the prussian blue-like compound and NaH2PO2 under a protective gas according to amass ratio of (0.2-0.4): (1-2) to obtain the cathode catalyst for hollow nano-electrolysis of water. The method is uniform in reaction heating, simple and easy to operate and easy to control, the used raw materials are low in cost, the target product is easy to obtain, and the prepared catalyst is of a hollow structure and has excellent electrocatalytic activity and cathode reaction stability.

The invention relates to a preparation method of carbon-loaded potassium vanadate and an application of the carbon-loaded potassium vanadate in a potassium ion battery. The chemical formula of the carbon-loaded potassium vanadate is KVOx@C, the KVOx@C is obtained by firstly obtaining a V2O3@C precursor through a sol-gel method and then obtaining a final product through high-temperature sintering and room-temperature stirring. The synthesis method is simple and convenient, and the energy consumption is low. According to the method disclosed by the invention, the precursor is of a carbon-coated nano-particle structure, so that the obtained final product is uniformly distributed nano-particles. In the charging and discharging process of the battery, more reaction active sites exist, and the effective capacity of the material can be improved to the maximum extent; in addition, the morphology of the nanoparticles shortens the transmission path of potassium ions in a solid phase, and is beneficial to rapid deintercalation of the potassium ions; meanwhile, the surface carbon layer structure is beneficial to improving electron conduction. The reaction kinetics is improved from the two aspects of ion diffusion and electron transfer, and the battery assembled by the composite material has excellent electrochemical performance.

The invention discloses a traveling mechanism of a pipeline detecting and cleaning robot and relates to the technical field of cleaning robots. The traveling mechanism mainly comprises caterpillar feet, a rack, an inner bin and the like. The traveling mechanism of the pipeline detecting and cleaning robot has the beneficial effects that a simple transmission mechanism is adopted; the traction force is great; the size is small; and the wall surface adhesion force is great.

An oriented quantitative arc support roller has the advantages of uniform abrasion of the support roller, and capabilities of reminding the replacing time, prolonging the service life, preventing a conveyor belt from sliding downwards and reducing the safety risk in operation. The oriented quantitative arc support roller is characterized in that the drum body is a round drum with two large-diameter end parts and a small-diameter middle part; the roller generatrix of the drum body is an arc line; an abrasion alarm slot and abrasion indication tables are respectively designed in the middle position and two sides of the drum body; a unidirectional moving mechanism is arranged at one or two sides of the drum body; the unidirectional moving mechanism comprises a counter-rotation prevention device and a ratchet wheel arranged on a shaft by a key slot; the returning stopping lock tail end of the counter-rotation prevention device is contacted with the ratchet wheel. The oriented quantitative arc support roller has the advantages of prolonging the service life of the support roller and a belt, preventing the left-right swing of the belt and the deviation of the belt, reducing the risk that the belt is torn and the support roller is abraded through, preventing the swing back and forth of the belt, improving the production stability, facilitating the maintenance, inspection and management, and preventing the safety accidents caused by the counter-rotation of the belt.

The invention discloses a Baijiu blending device and belongs to the technical field of Baijiu processing. The Baijiu blending device comprises a blending tank, wherein a plurality of rows of placement grooves are radially formed in the inner wall of the blending tank; seasonings wrapped with rice paper are stored in the placement grooves; a cover plate is arranged at the upper part of the blending tank; a feed opening is formed in the middle of the cover plate; an annular channel is arranged on the cover plate; a plurality of expansion blocks are circumferentially distributed on the cover plate; two elastic blocks which are oppositely arranged and can axially move along the axial direction of the cover plate are arranged below the expansion blocks; a steel ball is arranged at the upper part of a contacted surface of the two elastic blocks; the Baijiu blending device further comprises a stirring device; the stirring device comprises a stirring stick and a holding part; the stirring stick penetrates through the annular channel and enters the blending tank; external power drives the stirring stick to move along the annular channel through the holding part. According to the Baijiu blending device in the scheme, extra equipment is not needed; the whole structure is simple; meanwhile, the seasonings are uniformly distributed at all positions of the blending tank, so that the scheme is quick and uniform in blending.

The invention discloses an MOFs derivative Co-Ni-B-P composite material which is prepared by the following steps of: firstly, preparing Co-Ni-MOF by adopting a solvothermal method to form a flower cluster spherical primary structure; and carrying out boronizing treatment and phosphating treatment by adopting a chemical oxidation-reduction method to respectively form a nanosheet secondary structure and a nanoparticle tertiary structure. The effects of high porosity, material structure protection, material oxygen vacancy increase, specific surface area increase and ion transmission rate increase are achieved, and the effects of rapid Faraday reaction and conductivity improvement and pseudocapacitance providing are further achieved. The preparation method of the Co-Ni-MOF material comprises the following steps of: (1) preparation of a Co-Ni-MOF material; (2) boronizing treatment; and (3) phosphating treatment. The Co-Ni-MOF material is charged and discharged in the range of-0.1 V to 0.45 V when applied as a supercapacitor electrode material. When the discharging current density is 1 A/g, the specific capacitance is 1500 F/g to 1600 F/g. The Co-Ni-MOF material has the excellent material stability performance and the excellent ion transmission capacity.

The invention provides a column type super capacitor, and the column type super capacitor comprises : an electrode winding body, a mandrel, a shell, a positive electrode lead, a negative electrode lead and a sealing body, wherein the electrode winding body is composed of one, two or more than two electrode winding members; the electrode winding member is formed by winding a winding piece on the mandrel, and the winding piece is composed of a positive electrode, a negative electrode, a positive electrode collector and a negative electrode collector, a first diaphragm and a second diaphragm which are stacked together in a set sequenceand is of a multi-layer structure; the positive electrode collector and the negative electrode collector are respectively attached to the positive electrode and the negative electrode according to set intervals; the shell is used for wrapping the electrode winding body, the mandrel and the sealing body. The super capacitor can increase the effective contact area of the positive electrode and the negative electrode, and the electrode material adopts a high-porosity covalent organic framework material, so that the specific capacity of the super-capacitor is remarkably increased.

The invention discloses a counter electrode of a nickel iron selenide dye-sensitized solar cell. The counter electrode is fabricated by taking nickel chloride, iron chloride and selenium as raw materials and through in-situ synthesis by a one-step method. The raw materials are available, the fabrication method is simple, the obtained counter electrode of the nickel iron selenide dye-sensitized solar cell has relatively good photoelectric conversion efficiency and is expected to substitute a platinum electrode.