49results about How to "Solve structural instability" patented technology

The invention relates to a nano carbon material with a network structure consisting of polymer chains, in particular to a nano carbon sulfur composite material with a network structure suitable to be used in a secondary lithium sulfur battery anode and a preparation method thereof. The carbon sulfur composite material is formed by adopting the following steps of: introducing functional groups onto carbon particles by adopting the electric conductivity and the porosity of a carbon material and the reaction capacity of similar condensed aromatics of the carbon material and by means of an irreversible chemical reaction; introducing the polymer chains, wherein the polymer chains are stretched, bent and cross-linked on the surfaces of the carbon particles to form a cross-linked network structure; and compounding a sulfur element or a polysulfide (m is more than 2) containing -Sm- structure into the network structure to form the nano carbon sulfur composite material with the network structure. The carbon sulfur composite material has a rich cross-linked network structure, nano-scale network pores constrain the sulfur element or the polysulfide (m is more than 2) containing the -Sm- structure in the network, and the active substances are limited in a certain region to react, so that the composite material has predominant electrochemical performance.

The invention relates to a carbon-sulfur-shell matter composite material having a network dual-core shell structure and a preparation method thereof. The carbon-sulfur-shell matter composite material has a carbon-sulfur-shell three layer structure, a central core (inner core) is nano carbon particles, sulfur elemental or a polysulfide containing-Sm-structure (m>2) is directly deposited on the nano carbon particles, or functional groups are introduced onto the nano carbon particles by use of polycyclic aromatic hydrocarbon like reaction capacity of the carbon material and through an irreversible chemical reaction, polymeric chains are introduced in, a crosslinked network structure is formed through stretching, bending and crosslinking of the polymeric chains on the surface of the nano carbon particles, the sulfur elemental or the polysulfide containing the-Sm-structure (m>2) is composited onto the crosslinked network structure to form a nano sulfur layer having a network structure, then a mono-core shell nano composite material having a network structure is obtained and is used as a second layer (outer core) of the carbon-sulfur-polymer composite material having the network dual-core shell structure, an outermost layer is a shell matter layer, electronic and / or ionic conductivity of the material are / is improved, dissolving loss of discharge products can be further inhibited, and structural stability of the material is improved. The material is suitable for positive poles of lithium sulfur batteries, and has a prominent effect on improvement of cycle stability of the lithium sulfur batteries.

The invention relates to a nitrogen-containing binder for sulfur-lithium batteries and a preparation method thereof. The binder is a nitrogen-containing cyclodextrin polymer water-based binder with a three-dimensional network structure. The existing three-dimensional network structure can well bear the mechanical pressure brought by sulfur-lithium batteries in the charging and discharging process due to volume change, introduced nitrogen-containing functional groups can effectively inhibit the problems of dissolution and shuttle effect of polysulfide ions in electrolyte, a number of hydroxyl groups exist in the cyclodextrin and have strong hydrogen-bond interaction with anode material particles, and the stability of pole pieces can be maintained. In addition, the binder also has a role of increasing guide ions. Therefore, the binder can effectively solve the problem that a positive polysulfide material in the sulfur-lithium batteries is unstable in organization structure, the utilization rate of composite material active matter and the rate capability of the active matter can be improved, and accordingly the specific power, specific energy and cyclicity of the batteries can be improved.

The invention relates to a polymer and nanometer sulfur composite material with a shell and egg yolk structure and a preparation method of the composite material. The composite material is provided with the shell and egg yolk double-layer structure, a central nucleus is formed by sulfur particles, an outer shell is formed by a polymer, a gap is preserved between the central nucleus and the shell, so that the double-layer structure like an egg shell and an egg yolk is formed; elemental sulfur is shrunk in the process that the temperature is quickly changed by using the change of crystal form and the change of density in different temperatures, and the elemental sulfur is partially dissolved and separated out by using a solvent, so that the composite material of the shell and egg yolk structure is formed. The composite material of the structure is applicable to cathodes of lithium sulfur batteries, structure collapse caused by volume expansion in the discharge process of the elemental sulfur is relieved, the dissolution and loss of discharge products are inhibited, and the electrical conductivity and circularity of the material are improved.

The invention relates to a large-span steel corrugated plate arch bridge reinforcement structure. A large-span steel corrugated plate bridge has higher requirements for the thickness of a steel corrugated plate in the aspect of stress but is influenced by production processes, so that the maximum thickness only can reach 10 millimeters and cannot meet the requirements. The large-span steel corrugated plate arch bridge reinforcement structure provided by the invention comprises steel corrugated plates which are formed by splicing single plates, a plurality of adjacent grooved steel plates are longitudinally arranged on the steel corrugated plates, the cross sections of the grooved steel plates are in a shape like the Chinese character 'ji', and notches are downward; two ends of the grooved steel plates are fixed at the peaks of the steel corrugated plates; and steel bars are arranged between the steel corrugated plates and the grooved steel plates, and concrete is poured between the steel corrugated plates and the grooved steel plates. The reinforcement structure provided by the invention can feasibly improve the requirements of the steel corrugated plate arch bridge for stress, can overcome the defect of the existing production process, namely the problem of structure instability caused by thin steel corrugated pipes, can be suitable for steel corrugated plate assembly technology, and is simple in structure, low in manufacturing cost and convenient to operate by being connected with the steel corrugated plates by bolt screwing.

The invention provides a preparation method of DNA base pair cross-linked supermolecular hydrogel. Adenine and thymine are respectively modified to obtain a double bond connected base monomer, water serves as a solvent, the water and hydrophilic monomer acrylamide are subjected to thermal initiation by an initiator potassium persulfate, a high-molecular polymer with a three-dimensional network structure is formed through free radical copolymerization, and the polymer is subjected to the hydrogen-bond interaction of complementary pairing of DNA base pairs to obtain the DNA base pair cross-linked supermolecular hydrogel. According to the preparation method, the base pairs contained in a living body are introduced to polyacrylamide hydrogel, not only terminal connection is adopted, and the base pairs are inlayed into macromolecular chain segments, so that a large number of base pair hydrogen-bond interactions exist among chains, the mechanical properties are affected and stronger and more sensitive response is produced to salt and pH. The influence of the organic solvent is eliminated, and the DNA base pair cross-linked supermolecular hydrogel has good biocompatibility, viscosity and pH and salt responsiveness and can be used in the fields of gene transfer, gene therapy, drug controlled release, tissue engineering and the like.

The invention discloses a method using a hydrophobically modified core-shell catalyst ZIF-67@SiO2 in transfer hydrogenation of cinnamaldehyde to prepare cinnamyl alcohol. The method is characterized in that the hydrophobically modified core-shell catalyst ZIF-67@SiO2 is added to a reaction, for hydrogenation of cinnamaldehyde to prepare cinnamyl alcohol, in the presence of isopropanol, the reaction temperature is controlled to be 160-190 DEG C, the reaction time is controlled to be 12-18 h, and the reaction pressure is controlled to be 1-4 MPa. The catalyst has a low raw material price, and adopts non-noble metal, so the preparation cycle is short, and the production cost is low; and when the hydrophobically modified core-shell catalyst ZIF-67@SiO2 is used in the hydrogenation of cinnamaldehyde, the stability of a ZIFs material improved, the problem of unstable structure of the ZIFs is solved, the reusability of the catalyst is improved, and the hydrophobicity of the catalyst is also significantly improved, so the conversion rate of cinnamaldehyde and the selectivity of the target product cinnamyl alcohol are greatly increased.

The invention discloses a method for preparing a MnO@ nitrogen-doped porous carbon nanocomposite, comprising the steps of dissolving trimesic acid in deionized water at 80 degrees centigrade; maintaining a constant temperature in a water bath for a period of time; then dissolving manganese acetate in the deionized water; pouring a manganese acetate solution into a trimesic acid solution and stirring the two solutions at a constant temperature; after a constant-temperature reaction for a period of time, washing and centrifuging the reaction product to obtain a metal-organic framework, namely Mn-BTC powder; drying the Mn-BTC powder in a constant-temperature drying oven; and calcining the Mn-BTC powder in an ammonia atmosphere to obtain the MnO@ nitrogen-doped porous carbon nanocomposite. TheMnO@ nitrogen-doped porous carbon nanocomposite exhibits excellent electrochemical performance in lithium ion storage, and the porous carbon can alleviate the volume expansion of manganese oxide in alithiation process.

The invention discloses a method for constructing a biomimetic vascular net in a large-volume tissue engineering tissue organ. Firstly, biological information of a large-volume tissue of a human bodyis collected, and inputted into a computer for high biomimetic modeling; then, material separated printing and material-cell mixed printing output are performed with a hydrogel material and a varietyof amplified cells from the tissue by a high-precision biological 3D printer, wherein a hollow part in blood vessels is printed by a controllable degradable hydrogel; after all the hydrogel materialsare solidified, the controllable degradable hydrogel in the blood vessels are removed by means of specific enzymes or chelating reactions or temperature control or illumination and the like, and the vascular net in the large-volume artificial tissue is constructed. The circulation feeding of the vascular net and gas exchange in the large-volume artificial tissue are achieved by connection of mainblood vessels at two ends of the vascular net and a delivery pipe of a culture solution. The central feeding problem of the large-volume tissue is solved, so as to realize the long-term survival and biological function of the large-volume artificial tissue in vitro.

The invention discloses an earthenware brick external facade masonry curtain wall and a construction method thereof. The earthenware brick external facade masonry curtain wall is located between horizontal cantilever plates on the upper layer and the lower layer and comprises horizontal buried parts buried on the horizontal cantilever plates on the floors, vertical buried plates buried in a structure wall body, a steel structure keel fixed with the vertical buried plates through connecting short pipes and a masonry curtain wall body fixed with the steel structure keel through corner connectors. The masonry curtain wall body is formed by carrying out masonry operation on earthenware bricks through low-alkalinity cement mortar, wherein penetrating holes are formed in the middles of the earthenware bricks. Multiple stainless steel tie bars are arranged in the masonry curtain wall body, the upper end and the lower end of each stainless steel tie bar are planted into the horizontal cantilever plates on the upper layer and the lower layer correspondingly, the middles of the stainless steel tie bars vertically penetrate through the penetrating holes, a layer of bar-mat reinforcement sheetis arranged every 5-7 layers of earthenware bricks, and the two sides of each bar-mat reinforcement sheet are planted into the two sides of the wall body. The steel structure keel, the horizontal buried parts and the horizontal cantilever plates are fixed, through the vertical buried parts and the structure wall body, the bar-mat reinforcement sheets and the tie bars are additionally arranged topenetrate through the earthenware bricks and are planted into the concrete of the two sides, the appearance effect is met, and meanwhile connecting reliability and stability are effectively guaranteed.

The invention discloses a composite positive electrode material as well as a preparation method and application thereof in a zinc ion battery. The composite positive electrode material comprises a sulfur-doped three-dimensional network structure conductive polymer / graphene / carbon nanotube composite carbon material and vanadium tetrasulfide nanoparticles loaded on the surface of the composite carbon material, wherein the surface includes at least one of an outer surface of the conductive polymer particle, a lamellar surface and an interlayer of the graphene, and an outer surface of the carbon nanotube. The composite positive electrode material disclosed by the invention is excellent in conductivity, has good cycle performance and rate capability, and has a wide application prospect in zincion batteries.

The invention discloses a silicon oxide and titanium oxide composite material and a synthesis method thereof. The composite material takes titanium oxide as a core layer and silicon oxide as a shell layer. The synthesis method comprises the following steps: mixing titanium oxide with an alcohol solvent, adding a buffer solution and a silicon source, stirring, standing, washing, drying, and finallycarrying out a heat treatment to obtain the silicon oxide / titanium oxide composite material. The provided silicon oxide / titanium oxide composite material has a core-shell structure, the shell coatingis stable and not easy to fall off, and the synthesis method is simple and feasible.

The invention relates to an access opening for a cutter head of a shield tunneling machine and a construction method thereof. The access opening comprises an access opening segment, a positioning andprotecting cylinder, and a plurality of supporting and protecting cylinders, wherein the access opening segment is formed by excavating a soil body and is vertically arranged; the access opening segment is located in front of the advancing direction of the shield tunneling machine; the positioning and protecting cylinder is pressed into the access opening segment; the plurality of supporting and protecting cylinders are pressed into the positioning and protecting cylinder; the adjacent supporting and protecting cylinders are connected in an abutting joint manner; and a section of soil body isexcavated continuously and downwards before the corresponding supporting and protecting cylinders are pressed into the positioning and protecting cylinder, and thus, the access opening is formed in the plurality of supporting and protecting cylinders. The access opening is supported and protected by the supporting and protecting cylinders; and in the formation process of the access opening, aftera section of soil body is excavated, a section of supporting and protecting cylinder is settled. The access opening is supported and protected by using the supporting and protecting cylinders with thehigh strength, so that the deformation of the access opening is avoided in the maintenance of the cutter head, and the operation safety is improved. The access opening effectively solves the problemof the instability of the traditional reinforced concrete structure, and has very high practical value and promotion value.

The invention discloses a silicon oxide and carbon composite material and a synthesis method thereof. The composite material takes carbon as a core layer and silicon oxide as a shell layer. The synthesis method comprises the following steps: mixing carbon and an alcohol solvent, adding a buffer solution and a silicon source, stirring, standing, washing, drying, and roasting to obtain the silicon oxide / carbon composite material. The silicon oxide / carbon composite material has a core-shell structure, the shell coating is stable and not easy to fall off, and the synthesis method is simple and feasible.

The invention discloses a support system for a vibration table actuator embedded part group. The system comprises a supporting frame, a truss and a vertical adjusting assembly; the supporting frame comprises a plurality of supporting vertical columns and a plurality of supporting connecting beams for connecting two adjacent supporting vertical columns, and a vertical column inclined strut is fixedly arranged between each supporting vertical column and each supporting connecting beam; the truss is mounted over the supporting frame; and the vertical adjusting assembly is mounted over the truss;the vertical adjusting assembly comprises an adjusting plate used for transversely supporting the actuator embedded part group and a telescopic assembly connected between the adjusting plate and the truss, and when the actuator embedded part group set is transversely supported, the positions of the side edges of an anchor plate and a positioning plate are supported on the adjusting plate. The height position of each actuator embedded part can be finely adjusted, and meanwhile the problem that an existing support system is unstable in structure is solved.

The invention relates to a gas-fired hot water boiler air circulation energy saving system which comprises a boiler body, two burners, a flue, a chimney, energy savers, a water-cooling type condenser, a secondary air type condenser and a primary air type condenser, wherein the two burners arranged at intervals in an up-and-down manner are mounted at one end of the boiler body; a flue gas outlet is formed at the other end of the boiler body, and is in sealing connection with the flue; an outlet of the flue is connected to the upright chimney; the energy savers sequentially arranged in a two-stage manner are mounted in the flue between the boiler body and the chimney; the chimney is provided with the water-cooling type condenser, the secondary air type condenser and the primary air type condenser from bottom up sequentially; an air blower is communicated with and mounted at one side of the lower part of the chimney; and an exhaust outlet of the air blower is communicated with air inlets of the burners of the boiler body through sealed pipelines. The gas-fired hot water boiler air circulation energy saving system operates stably, is safe and reliable, has strong output, is high in efficiency and low in exhaust gas temperature, reaches flue gas emission indexes, and meets the requirements of market development better.

The invention discloses a silicon oxide and iron oxide composite material and a synthesis method thereof. The composite material takes iron oxide as a core layer and silicon oxide as a shell layer. The synthesis method comprises the following steps: mixing iron oxide and an alcohol solvent, adding a buffer solution and a silicon source, stirring, standing, washing, drying, and carrying out a heattreatment to obtain the silicon oxide and iron oxide composite material. The silicon oxide and iron oxide composite material provided by the invention has a core-shell structure, the shell coating isstable and not easy to fall off, and the synthesis method is simple and feasible.

The invention relates to a large gas-fired hot water boiler. The large gas-fired hot water boiler comprises a boiler body, combustors, a flue, a chimney, economizers, a water-cooling-type condenser, a second-stage air-type condenser and a first-stage air-type condenser, wherein one end of the boiler body is provided with the two combustors which are vertically arranged at an interval; the other end of the boiler body is provided with a smoke outlet and is connected with the flue in a sealed manner; the outlet of the flue is connected with the vertical chimney; two stages of economizers are sequentially arranged in the flue between the boiler body and the chimney; the water-cooling-type condenser, the second-stage air-type condenser and the first-stage air-type condenser are sequentially arranged on the chimney from bottom to top; and smoke in the boiler body is exhausted from the boiler body, sequentially passes through the two stages of economizers, the water-cooling-type condenser, the second-stage air-type condenser and the first-stage air-type condenser, and is finally exhausted through the upper end of the chimney. The large gas-fired hot water boiler has the advantages that the operation is stable; safety and reliability are ensured; the output is sufficient; the exhaust gas temperature is low; the efficiency is high; the smoke emission index meets the requirement; and the market development requirement is better met.

The invention discloses a PCB-used mark point repairing method. The method comprises the following steps: S1, an art paper sheet and a micro mounted film are laminated through a laminator to form a composite sheet; S2, according to the film for the needed mark point pattern, the laminated composite sheet is developed through a developing solution; S3, the developed composite sheet is etched by using an etching solution; S4, the etched composite sheet is subjected to film stripping through a film stripper, a copper point attached to the micro mounted film is formed, and the composite sheet is cleaned by using deionized water; S5, a plating solution is sprayed on the surface of the copper point, electroless nickel and gold is applied, the mark point is formed, the plating solution comprisesNi<2+>: 0.082 mol / L and Au: 0.3 to 1.0 g / L, and the composite sheet is cleaned by using deionized water; and S6, the mark point is picked off from the micro mounted film, an adhesive is used to bond the mark point to a to-be-repaired mark point. The mark point is adopted to repair the PCB under panel-size outgoing, the overall yield of the PCB can be enhanced, and particularly for a flexible circuit board which is easy to cockle and whose edge MARK is damaged usually, by adopting the method of the invention, the yield of the FPC can be increased by about 2%.

The invention discloses a silicon oxide and calcium oxide composite material and a synthesis method thereof. The composite material takes calcium oxide as a core layer and silicon oxide as a shell layer. The synthesis method comprises the following steps: mixing calcium oxide with an alcohol solvent, adding a buffer solution and a silicon source, stirring, standing, washing and drying, and finallycarrying out a heat treatment to obtain the silicon oxide / calcium oxide composite material. The silicon oxide and calcium oxide composite material provided by the invention has a core-shell structure, the shell coating is stable and not easy to fall off, and the synthesis method is simple and feasible.

The invention discloses a silver-plated copper strip wrapping structure of a stable-phase cable, manufacturing equipment and a preparation method thereof. According to the silver-plated copper strip wrapping structure of the stable-phase cable, an inner conductor is wrapped with an insulating layer, silver-plated copper strips are arranged outside the insulating layer, an inclination angle is formed between each silver-plated copper strip and the insulating layer, and the silver-plated copper strips are sequentially staggered. And the other layer of silver-plated copper strip is arranged belowthe upward inclined side of the silver-plated copper strip. According to the equipment of the silver-plated copper strip wrapping structure of a stable-phase cable, a wrapping machine comprises a pressing rod, thimbles are inserted into the two ends of the pressing rod, cover plates are installed at the two ends of the pressing rod through the thimbles, and an inward V-shaped slope groove is formed in the surface of the pressing rod on one side of the pressing rod. On the basis of low-density polytetrafluoroethylene insulation coating, a silver-plated copper strip wrapping material, silver-plated copper strip wrapping equipment, a novel wrapping tool and a novel process act together for processing. By using the silver-plated copper strip wrapping structure, the tightness inside the silver-plated copper strip wrapping layer is improved, and the binding force between the silver-plated copper strip wrapping layer and the insulating layer is increased.

The invention relates to a water way circulation energy saving system of a gas-fired hot water boiler. The system comprises a furnace body, combustors, a flue, a chimney, an energy economizer and a water cooling type condenser, wherein two combustors are vertically spaced at one end of the furnace body; a smoke outlet is formed in the other end of the furnace body, and is tightly connected with the flue; an outlet of the flue is connected to the vertical chimney; the two-grade energy economizer is mounted in the flue between the furnace body and the chimney in sequence; and the water cooling type condenser is mounted on the chimney. The system is stable in operation, safe, reliable, sufficient in force, low in smoke discharge temperature and high in efficiency, reaches the smoke discharge index, and is more accordant with the market development demands.

The invention relates to the technical field of lithium batteries, and particularly discloses a ternary composite oxide matrix material, a ternary positive electrode material, a preparation method and a lithium ion battery prepared from the ternary composite oxide matrix material and the ternary positive electrode material. The ternary positive electrode material is prepared from a ternary composite oxide matrix material, the chemical formula of the ternary composite oxide matrix material is Li1+nNi0.4+xCo0.6-x-y-zAlyBzO2, x is larger than or equal to 0.00 and smaller than 0.6, y is larger than or equal to 0.01 and smaller than 0.4, z is larger than or equal to 0.01 and smaller than 0.4, x+y+z is smaller than 0.6, and n is larger than or equal to 0.00 and smaller than 0.25. The problem that manganese is dissolved out of an existing positive electrode material is solved, and the stability of nickel and the structural stability of a nickel-cobalt-aluminum material are improved; magnetic substances in the material and residual lithium on the surface of the material are removed, so that the stability of the ternary positive electrode material is improved, and the prepared lithium ion battery has good capacity performance, cycle performance and high-temperature storage performance.

The invention discloses a fastener. The fastener comprises a top plate, a front side plate, a rear side plate and a threaded connecting piece, wherein an installation hole is formed in the plate surface of the top plate, the upper end of the front side plate is connected with one of the left end and the right end of the front plate edge of the top plate, the lower end of the front side plate is provided with a first matched structure connected with an auxiliary rib of a mineral wool board fan-shaped suspended ceiling system, the upper end of the rear side plate is connected with the other one of the left end and the right end of the rear plate edge of the top plate, the lower end of the rear side plate is provided with a second matched structure connected with an auxiliary rib of the mineral wool board fan-shaped suspended ceiling system, and the threaded connecting piece is installed inside the installation hole. According to the fastener, the front side plate and the rear side plate are arranged in a spaced mode both in the front-back direction and the left-right direction, so that the main rib rotates between the front side plate and the rear side plate within a certain range after stretching into the portion between the front side plate and the rear side plate, the main rib is compressed through the threaded connecting piece, the two side faces of the main rib are made to compress one opposite side edges of the front side plate and the rear side plate, and therefore the main rib and the auxiliary rib can be firmly fixed together.

The invention relates to a preparing method for a foaming aluminum material. The foaming aluminum material is prepared with ammonium chloride and aluminum scraps as raw materials. According to the preparing thought, after the ammonium chloride and the aluminum scraps are mixed, suspension viscous fluid is formed through the ammonium chloride, the aluminum scraps, epoxy resin and a dispersing agent, high-temperature sealing sintering and gradient pressure reducing sintering are conducted after high-pressure pressing, and finally the foaming aluminum material is obtained. Compared with the prior art, the problem of instable structures is thoroughly solved; the preparing method is simple, batched production is facilitated, and the production cost is low; and prepared foaming aluminum has a stable and uniform pore structure, and pore controllability is improved.

The invention provides a power battery cell and a battery pack, the power battery cell comprises a battery cell body and a shell assembly, the battery cell body is arranged in the shell assembly, and an expansion gap is formed between the battery cell body and the shell assembly; and the elastic assembly is arranged in the expansion gap. The power cell solves the problem that a power cell in the prior art is unstable.