44results about How to "Avoid structural collapse" patented technology

The invention discloses a method for preparing a graphene wrapped 3D flowerlike nickel sulfide / foamed nickel material. The method comprises the following steps: preparing a nickel sulfide / foamed nickel composite material by using a hydrothermal method, and performing vulcanization treatment on the surface of the foamed nickel by taking thioacetamide as a sulfur source so as to grow flaky nickel sulfide uniformly on the surface of the foamed nickel; wrapping the surface of the nickel sulfide / foamed nickel with a layer of graphene oxide through physical adsorption; performing thermal expansion and reduction on the adsorbed graphene oxide by using a rapid thermal expansion method, thereby obtaining the graphene wrapped composite material. The method is wide in nickel sulfide material source and simple in preparation process, the lithium extraction and insertion efficiency can be improved, and the electrochemical properties of the material can be improved; the conductivity and the structural stability of the material are improved, and the internal resistance of the material can be reduced; the electric conductivity of the material is improved, and effective pores can be provided for extraction and insertion of lithium ions due to C vacancy generated in the reduction process of the graphene.

The invention relates to the field of lithium ion battery materials, and provides an Al / La co-doped high-nickel ternary precursor with a core-shell structure and a preparation method thereof, and a positive electrode material prepared from the precursor. The preparation method mainly comprises the following three steps: step 1, synthesizing an Al-doped high-nickel ternary precursor with rod-like primary particles under the condition of a low pH value; 2, increasing the pH value on the basis of the step 1, growing a La-doped high-nickel ternary precursor shell with needle-shaped primary particles by taking the Al-doped high-nickel ternary precursor as an inner core so as to synthesize an Al / La co-doped high-nickel ternary precursor with a core-shell structure; and 3, mixing the Al / La co-doped high-nickel ternary precursor with the core-shell structure and a lithium salt, and carrying out high-temperature calcination in an oxygen atmosphere to obtain the Al / La co-doped ternary positive electrode material with the core-shell structure. Due to the unique co-doped core-shell structure, the stability of an internal structure is effectively enhanced, the generation of mixed phases such ascation mixing and rock salt structures is inhibited, the breakage of grain boundaries is reduced, the average oxidation state of manganese ions is improved, the Jahn-Teller effect is effectively inhibited, the rapid attenuation of the capacity in a cycle process is reduced, the cycle stability of the material is remarkably improved, and the cycle life of the material is remarkably prolonged. Theproduct synthesized by adopting a coprecipitation method is uniform in component, good in sphericity, good in reproducibility, easy in condition control, low in preparation cost, high in economic value and wide in application prospect.

The invention discloses a solar high-temperature reactor integrating phase-change storage energy and chemical storage energy and belongs to the field of solar high-temperature heat utilization. A quartz glass board is connected to the open end of the left side of a reactor shell, a reaction cavity is constituted by the quartz glass board and the reactor shell, a working medium inlet is formed in the left side of the reactor shell, a working medium outlet is formed in the right side of the reactor shell, an overall porous catalyst is arranged in the reactor shell, a phase-change energy storageis mounted on the outer side face of the reactor shell, a phase-change energy storage shell is arranged on the outer surface of the phase-change energy storage, and the phase-change energy storage shell is wrapped with a heat preservation layer. The solar high-temperature reactor can still provide heat energy required by a reaction when illumination is unstable and the solar high-temperature reactor is in a shadow place, and continuous conducting of the chemical reaction is kept; in addition, the temperature of the edge of a porous structure of a chemical reaction layer can be maintained, theradial temperature gradient is decreased while a reaction area is enlarged, and structural collapse caused by stress concentration is prevented; and part of heat in waste gas is recovered to preheat inlet gas.

The invention discloses a molybdenum-doped porous silicon-carbon composite material, a preparation method thereof and a lithium ion battery. The molybdenum-doped porous silicon-carbon composite material comprises porous nano-silicon, molybdenum oxide, graphene and amorphous carbon, the molybdenum oxide and the porous nano-silicon are loaded on the graphene and are connected with the graphene through chemical bonds. According to the molybdenum-doped porous silicon-carbon composite material disclosed by the invention, molybdenum oxide and graphene are doped between the silicon-carbon materials,and the synergistic effect among the molybdenum oxide, the graphene and the silicon-carbon materials is exerted, so that the specific capacity and the cycle performance of the material are improved while the conductivity of the material is improved and the expansion is reduced.

The invention discloses a polymethyl methacrylate micropore diaphragm which is mainly applied to a lithium ion battery. The micropore diaphragm is prepared by a supercritical fluid phase separation method.

The invention discloses a sewer well treatment method and a fast-setting cement mortar dry blend. The sewer well treatment method includes the steps of (1) carrying out cutting to form an annular zone around a sunk sewer well cover, and taking out the sewer well cover, (2) digging out basic layer materials of the annular zone, placing a prefabricated piece at an opening of a sewer well, placing the well cover on the prefabricated piece, and adjusting the horizontal position to enable the upper surface of the well cover to be flush with the road surface, and (3) pouring the annular zone dug out around the prefabricated piece with fast-setting cement mortar. According to the sewer well treatment method, the strength of a structure around the sewer well is improved, rainwater is prevented from permeating the sewer well, and the sinking problem of the urban sewer well can be effectively solved. The construction speed is high, and traffic is not influenced. The fast-setting cement mortar dry blend comprises cement, sand, expanding agents, water reducing agents, calcium oxide and the like. The sewer well treatment method and the fast-setting cement mortar dry blend are suitable for treating the sewer well of the cement road surface and the sewer well of the pitch road surface.

The invention discloses a lithium ion battery with a polymethyl methacrylate micropore diaphragm. The micropore diaphragm is prepared by a supercritical fluid phase separation method.

The invention belongs to the technical field of preparation of reforming hydrogen production catalysts and provides a reforming hydrogen production composite catalyst as well as a preparation method and an application thereof. The preparation method comprises the following steps: (1) mixing a mixed metal ion salt solution with a precipitant solution, and reacting; (2) carrying out aging crystallization and solid-liquid separation on a product obtained after the reaction, and taking a precipitate; and (3) roasting the precipitate to obtain the composite catalyst. According to the composite catalyst provided by the invention, the difference between the actual CO2 adsorption capacity and the theoretical adsorption capacity of the composite catalyst is further reduced, and the problems of lowactivity and poor cycling stability of the catalyst used in the CO2 adsorption enhanced CH4 / H2O reforming hydrogen production process are solved.

The invention discloses a composite oxidized granular filter material and a preparation method thereof, relates to the technical field of filter materials, and solves the technical defects that the existing filter material is low in oxidant bearing capacity, easy to block gaps of an adsorbent and a granular filter material and lack of auxiliary adjuvants. The chemical active components comprise an oxidizing agent, an adsorbent and an auxiliary adjuvant, the auxiliary adjuvant comprises an alkaline agent, the oxidizing agent comprises an oxidizing agent part A infiltrating into a core skeleton and an oxidizing agent part B mixed in a core peripheral wrapping layer, the adsorbent and the auxiliary adjuvant are mixed in the wrapping layer, and the weight ratio of the oxidizing agent part A to the core skeleton is 0.1-0.3. The weight ratio of the part B of the oxidizing agent to the adsorbent is 0.1-0.2, the weight ratio of the total weight of the part B of the oxidizing agent and the adsorbent to the core skeleton is 0.3-3, and the weight ratio of the part B of the oxidizing agent to the alkaline agent is greater than or equal to 3. The content of the oxidant in the filter material is high, and the phenomenon that the oxidant crystallizes to block adsorbent gaps is reduced under the cooperation of the alkaline agent.

The invention provides a lithium ion battery with a polyvinylidene fluoride-hexafluoropropylene microporous membrane. The microporous membrane is prepared by a supercritical fluid phase separation method.

The invention discloses a lithium-philic alloy modification layer, a composite lithium negative electrode material, and a preparation method and application of the material, and belongs to but is not limited to the technical field of batteries. A dissimilar element M is added into molten metal lithium to obtain a molten lithium alloy Li-M, the molten lithium alloy Li-M is in contact with the surface of a metal material N, the lithium-philic alloy modification layer at least containing elements M and N is spontaneously formed on the surface of the metal material N, the lithium-philic alloy modification layer induces a liquid lithium alloy and / or liquid lithium to be adsorbed on the surface of the metal material N, and then the liquid lithium alloy and / or the liquid lithium are cooled to room temperature to obtain the solid-state composite lithium negative electrode material which has a three-layer structure containing a metal material N framework layer, the lithium-loving alloy modification layer and a Li-M lithium alloy / metal lithium layer and comprises at least three components. The preparation problem of an existing composite lithium negative electrode material and the problems of lithium dendrite growth, electrode volume expansion and structure pulverization in the circulation process are solved.

The invention relates to a high-intensity low-carbon alkane dehydrogenation catalyst and a preparation method thereof. The preparation method comprises the following steps: mixing a catalyst carrier precursor, an active component precursor, a structural additive precursor and an active additive precursor, and forming once, drying, and baking to prepare the catalyst. The low-carbon alkane dehydrogenation catalyst prepared by the invention is high in activity and selectivity, is good in structural stability, can be applied to the dehydration reaction of C3-C5 alkane, and is used for fixed bed reactors, mobile bed reactors and fluidized bed reactors.

The invention discloses a construction scheme of a floating air-rib composite water-pillow pneumatic membrane structure, and belongs to the technical field of membrane structure construction. The construction scheme comprises the steps of mounting of air rib assemblies, inspection of memebrane materials, setting-out of membrane pieces, clipping of the membrane pieces, pre-assembling of the memebrane materials, heat fusion connection of memebrane material force-bearing seams, connection of the memebrane materials and an exit and entrance, edge corner treatment of the memebrane materials, treatment of the water-pillow memebrane in the memebrane materials, arranging of a supporting sling, mounting of the membrane structure and the like. The construction scheme of the floating air-rib composite water-pillow pneumatic membrane structure aims to improve the fireproof performance of the floating air-rib composite water-pillow pneumatic membrane structure while the characteristics of low costof the membrane structure and the simple construction process are prominent, and therefore, the construction scheme mainly embodies reasonable mounting of the water pillow and perfect fusion of the water pillow and the membrane structure; and no waste residue, waste gas, waste water and noise are generated in the construction process, pollution and destruction to the surrounding environment are eliminated, the attractive form of buildings, structures and public facilities can be shaped to form landscapes and scenic spots , and beautifying of the urban environment is facilitated.

The invention relates to a rolling grouser method and a rolling grouser structure. The rolling grouser method is adopted, rolling friction matching between a grouser and wheel bodies replaces traditional sliding friction matching, rollers capable of rotating transversely are fixedly disposed at the positions, where the grouser and the wheel bodies transversely and mutually butt against, on a crawler device, the rollers are matched with the side faces of the crawler wheel bodies in a rolling manner, and through rolling and butting against matching, transverse force on various wheel bodies on the crawler device is transmitted to a crawler to guide a moving direction of the crawler. The rolling grouser structure designed with the rolling grouser method is adopted to match with the wheel bodies of the crawler device, so that friction force between the grouser and the various wheel bodies can be reduced effectively, and particularly internal molecular structure heat effect caused by sliding friction of a rubber crawler is reduced, and internal molecular structural collapse caused by heat effect temperature rising of the rubber crawler is avoided effectively.

According to the positive electrode material coated with the co-embedded thin film, the preparation method and the lithium ion battery, the co-embedded thin film is deposited on the surface of the positive electrode material through an atomic layer deposition method, so that the positive electrode material coated with the co-embedded thin film is obtained. The co-embedded thin film comprises an amorphous oxide layer of phosphorus and an amorphous oxide layer of titanium. By adopting the atomic layer deposition method, the precise regulation and control of the element content and proportion can be realized, the cost is low, the coating period is short, and the PO bond in the obtained co-embedded film with the specific element proportion and content can prevent the material structure collapse caused by material deoxidation; and the amorphous oxide layer of phosphorus and residual lithium of the positive electrode material can form fast ion conductor lithium phosphate, so that the interface impedance is reduced. The amorphous oxide layer of titanium has the effect of blocking electrolyte erosion. Therefore, the positive electrode material coated with the co-embedded film and the lithium ion battery assembled by the positive electrode material have relatively high capacity and cycle performance.

The invention discloses a polypropylene microporous diaphragm which is mainly used for a lithium ion battery. The microporous diaphragm is prepared by a supercritical fluid phase separation method.

The invention discloses a power distribution cabinet convenient to mount and dismount. The power distribution cabinet comprises a cabinet body mechanism. The cabinet body mechanism is internally and fixedly connected with a dustproof mechanism and an inner frame mechanism. One side surface of the cabinet body mechanism is connected with a door body mechanism; the upper end and the lower end in thecabinet body mechanism are connected with a plurality of locking mechanisms; and side plate mechanisms are connected to the two side faces, adjacent to the door body mechanism, of the cabinet body mechanism. The cabinet body mechanism comprises a top plate, a bottom plate, side clamping frames, side inserting strips, a back plate, bottom inserting strips, a base, a first inserting groove, an upper frame plate and an installing base. The two ends of one side edge of the top plate are fixedly connected with the side clamping frames respectively. The advantages are that the power distribution cabinet is novel in structure and convenient to use, and is a novel and practical power distribution cabinet convenient to mount and dismount.

The invention relates to an additive for a flower-scented cigarette filter rod and a preparation method of the additive, and belongs to the technical field of cigarette additives. Graphene oxide is subjected to a reduction reaction through a natural reducing agent, the obtained reduced graphene oxide reacts with a flower-scented aldehyde compound and dopamine hydrochloride, then soxhlet extractionis conducted, a graphene-based composite is obtained, and finally, the graphene-based composite prepared from various raw materials is compounded into cigarette graphene-based composite microspheres.The microspheres can selectively adsorb lauric aldehyde, myristic aldehyde, undecanal, peach aldehyde and cocoanut aldehyde from complex natural essences and flavors, the adsorption capacity is controllable, the adsorption intermolecular force of the microspheres is mainly non-covalent bond force, good heat conductivity is achieved, and in the using process, desorption can be quickly conducted; and the microspheres are prepared to form the additive for the flower-scented cigarette filter rod to be added into the filter rod to be used, the flower fragrance can be provided, the cigarette flavoris enriched, the smoking quality is improved, heat subsidence can further be prevented, and application and popularization are easy.

The invention discloses a metal chain-steel fiber concrete beam component. The component is a component beam composed of a metal chain-steel plate cage and steel fiber concrete, and belongs to the technical field of steel bar concrete. The metal chain-steel fiber concrete beam component has certain energy-dissipation crack resistance capacity under impacting, exploding and other power load functions, the steel fiber concrete in the component develops deformation coordination capability of the steel fiber concrete, the metal chain-steel plate cage tightly wraps the steel fiber concrete, the purpose of bearing power load is achieved, generating and developing of cracks are further prevented, the component of the form can be applied to various structural forms, and the component can be prefabricated in a machining factory and can also be poured on-site, so that the problem that under the fact that a building structure encounters a power load function, local or whole collapsing of the structure is caused by damages of the component beam is solved.

The invention relates to a method for producing primary-color low-fat crisp mushroom chips, which belongs to the technical field of fruit and vegetable food processing. The method for producing the crisp mushroom chips comprises the following main steps of: carrying out conventional selection, root removal, slicing, washing, color protection and blanching treatment in filling liquid on a mushroomraw material; then carrying out vacuum frying dehydration and vacuum centrifugal deoiling; and finally carrying out non-fried dehydration, flavoring and packaging. In the invention, a combined treatment method for sequentially carrying out filling liquid blanching treatment, vacuum frying dehydration and non-fried dehydration is adopted. The produced crisp mushroom chips have attractive appearance and crisp taste with the maintained color, aroma and taste of mushrooms, and the oil content of a final product is below 10 percent; and compared with the traditional vacuum frying method, the invention reduces the production cost by more than a quarter and improves the production efficiency by more than 1.5 times.

The invention belongs to the technical field of road and bridge construction, and particularly relates to a movable road and bridge construction safety protection device which comprises a landing frame. The lifting mechanism is fixedly connected to the top of the landing frame, and the lifting mechanism is used for lifting a top structure; the connecting assembly is fixedly connected to the outer sides of the lifting mechanisms, and the connecting assembly is used for fixing the position between the two lifting mechanisms; the vertical rod is movably connected to the inner wall of the lifting mechanism, the arranged connecting assembly facilitates combination of the two landing frames, the weight of the structure on the bridge floor is increased, the toppling condition is avoided, after the arranged storage assembly is opened, construction tools and the like can be conveniently placed, and operation is convenient; during working, a constructor can stand on the treading bottom plate and construct or maintain the side edge of a constructed road and bridge.

The invention discloses a power distribution cabinet convenient to mount and dismount. The power distribution cabinet comprises a cabinet body mechanism. The cabinet body mechanism is internally and fixedly connected with a dustproof mechanism and an inner frame mechanism. One side surface of the cabinet body mechanism is connected with a door body mechanism; the upper end and the lower end in thecabinet body mechanism are connected with a plurality of locking mechanisms; and side plate mechanisms are connected to the two side faces, adjacent to the door body mechanism, of the cabinet body mechanism. The cabinet body mechanism comprises a top plate, a bottom plate, side clamping frames, side inserting strips, a back plate, bottom inserting strips, a base, a first inserting groove, an upper frame plate and an installing base. The two ends of one side edge of the top plate are fixedly connected with the side clamping frames respectively. The advantages are that the power distribution cabinet is novel in structure and convenient to use, and is a novel and practical power distribution cabinet convenient to mount and dismount.

The invention discloses a molybdenum-doped porous silicon-carbon composite material, a preparation method thereof and a lithium ion battery. The molybdenum-doped porous silicon-carbon composite material includes porous nano-silicon, molybdenum oxide, graphene and amorphous carbon, and the molybdenum oxide and porous nano-silicon are supported on the graphene and are connected with the graphene through chemical bonds. The molybdenum-doped porous silicon-carbon composite material of the present invention is doped with molybdenum oxide and graphene between the silicon-carbon materials, and exerts the synergistic effect between the three, while improving the electrical conductivity of the material and reducing the expansion, the The specific capacity of its material and its cycle performance.

The invention discloses a polyvinylidene fluoride micropore diaphragm which is mainly applied to a lithium ion battery. The micropore diaphragm is prepared by a supercritical fluid phase separation method.

The invention discloses a preparation method of multi-channel surface modified amorphous iron oxide nanospheres. The preparation method comprises the following specific steps: (1) preparing a precursor solution; (2) transferring the precursor solution to a hydrothermal kettle, setting the temperature to be 180-200 DEG C, and carrying out hydrothermal treatment for 1-6 hours; (3) repeatedly centrifuging and washing the precipitate to remove redundant reaction ions; and (4) drying for 8-12 h at a drying temperature of 80-110 DEG C. According to the invention, iron oxide nanoparticles are prepared by adopting a hydrothermal method, and the multi-channel surface-modified amorphous iron oxide nanospheres are obtained by utilizing a synergistic effect of curing and hydrogen ion etching in a hydrothermal reaction; and the multi-channel surface-modified amorphous iron oxide nanospheres can be used as a lithium ion battery negative electrode material to obtain relatively good electrochemical performance, which is of great significance in further development of the iron oxide amorphous material in the field of lithium ion batteries.

The invention discloses a method for butting and synchronously unloading segments of a steel truss structure in the air. The method comprises the following steps: (1) manufacturing and mounting a temporary supporting frame; (2) manufacturing and mounting an operating platform; (3) manufacturing and mounting a scaffold; (4) hoisting a truss in position; (5) butting truss segments in the air and permanently fixing; (6) enabling a jack to be in position; (7) mounting a first U-shaped sleeve groove; (8) removing the scaffold, and mounting a lower bearing beam; (9) mounting a second U-shaped sleeve groove; (10) mounting a limiting steel pin rod and a limiting plate; and (11) unloading step by step. The method disclosed by the invention has the advantages that the problem that the quality is difficult to control when a long-span plane truss adopts a segmental mounting method is effectively solved, an unloading process is steady and controllable, the phenomena that the original structure produces larger deflection, local rod pieces are over-stressed, node connection is destroyed and even structure collapse is caused due to an improper unloading scheme can be avoided, and synchronous unloading of the truss structure is realized.

A heat pipe heat exchanger (12, 12') for transferring heat from a hot gas to a cold gas comprises a housing with a first chamber (14) for feeding a hot gas therethrough; a second chamber (20) for feeding a cold gas therethrough; and a plurality of heat pipes (26) extending between the first chamber (14) and the second chamber (20) for transferring heat from the hot gas to the cold gas. The heat pipe heat exchanger (12, 12') further comprises one or more heat pipe cartridges (36) removably arranged in the housing. Each heat pipe cartridge (36) comprises a frame (38) with a support panel (40) for supporting a plurality of heat pipes (26); the support panel (40) being arranged such that, when the heat pipe cartridge (36) is arranged in the housing, the support panel (40) cooperates with a separation wall (32) between the first chamber (14) and the second chamber (20) to form a gas-tight partition between the first and second chambers (14, 20). The heat pipes (26) traverse the support panel (40) and are secured thereto in a gas-tight manner.

The invention relates to a method technology of ink direct writing three-dimensional printing based on near-infrared photopolymerization, and belongs to the technical field of material processing. The method is as follows: the direct writing nozzle moves or is still in the three-dimensional space, the ink is extruded from the direct writing nozzle, and after being irradiated by near-infrared light, the three-dimensional object is formed after curing, and the curing time t does not exceed the near-infrared light diameter d l vs. ink extrusion speed v i Ratio, ie t≤d l / v i . Since near-infrared light has better medium penetration, it can penetrate the structure during molding to promote a higher degree of solidification inside and outside, so that 3D printing of cross-scale structures can be realized, and the method provided by the present invention is accurate The curing process of the ink is controlled, so as to realize the real-time curing of the DIW array 3D structure.