64results about How to "Assuring Structural Integrity" patented technology

The application provides a composite current collector for a zinc-iodine battery, a preparation method thereof and a zinc-iodine battery, and provides a conductive plastic substrate as a support layer; a metal conductive layer is formed by depositing titanium on at least one side surface of the conductive plastic substrate by using a magnetron sputtering technology, so that the composite current collector for the zinc-iodine battery is obtained. The application realizes the synergistic improvement of the light weight and the corrosion resistance of the current collector.

The invention discloses a sealing method for an optical fiber element, and relates to the technical field of optical element connection, in the sealing method, a pretreated assembly component is directly sealed under micro-positive pressure inert gas, and the sealing reliability can be improved from multiple aspects of oxidation prevention, atmosphere control, quality improvement, process stabilization and the like; the temperature of the graphite jig changes more gently in the heating and cooling stages, heat permeates uniformly in the heating process, and local thermal shock is avoided; and during cooling, heat is quickly and uniformly dissipated, so that the cooling rate difference of all parts of the sealing piece is reduced, and thermal stress accumulation is greatly reduced. In the sealing heating stage, the graphite jig can quickly and uniformly conduct heat of a heat source, the problem that a local area is overheated or heated insufficiently can be avoided, it is guaranteed that glass solder is synchronously melted and wetted on the whole sealing interface, the defects that the solder is uneven in spreading, local fusion is incomplete and the like due to the temperature gradient are overcome, and the service life of the glass solder is prolonged. And the air tightness and the structural integrity of a sealing interface are ensured.

The invention relates to the technical field of black metal heat treatment, and discloses a structure modification strengthening process of a carbon fiber induced high-damping nodular iron casting, which comprises the following steps: austenitizing and preserving heat of the nodular iron casting with pre-buried directionally distributed carbon fiber bundles in a controlled carbon potential environment, so that a matrix forms a carbon concentration gradient field; quenching to be close to a martensite transformation starting point; intermittent spray cooling is executed through a cooling control unit in a martensite phase transformation interval; according to the method, martensite laths are induced to radially and directionally grow at an interface by utilizing a pulsating heat flow field generated by utilizing the axial high heat conduction characteristic of the carbon fibers, and a radial grain boundary structure with the carbon fibers as the axis is constructed, so that interface internal friction is generated by utilizing the radial grain boundary structure when a casting bears an excitation load, and vibration energy is dissipated; and the nodular iron casting generates damping response on the premise of maintaining the hardness of a matrix, and stress concentration at a heterogeneous interface is eliminated.

The invention relates to an energy storage device and a power utilization system. The energy storage device comprises a shell, an electrode assembly, an end cover assembly and a binding piece, wherein the shell is provided with an accommodating cavity; the electrode assembly is arranged in the accommodating cavity, the electrode assembly comprises a plurality of tabs and an electrode main body which are electrically connected, and the tabs and the electrode main body are arranged along a first direction; the end cover assembly is arranged on one side of the shell and used for sealing the containing cavity. The binding piece is positioned between the end cover assembly and the electrode main body; the binding piece is provided with a penetrating hole, and the penetrating hole penetrates through the two opposite surfaces of the binding piece in the first direction. The penetrating hole extends along a second direction, the plurality of tabs penetrate through the penetrating hole, and the first direction is intersected with the second direction; the penetrating hole is provided with a first side wall and a second side wall which are oppositely arranged in the second direction, and in the second direction, the distance between the first side wall and the second side wall is larger than the size of the ends, close to the electrode body, of the tabs.

The invention relates to a nickel-plated copper stranded conductor production process and equipment for a high-speed rail, and relates to the technical field of metal conductor machining, the nickel-plated copper stranded conductor production process comprises a base, an unwinding device, a dynamic stranding device and a winding device are installed on the base, and the dynamic stranding device comprises a support, a first gear and a second gear. The winding device comprises a motor, a second rotating rod, a first bevel gear, a second bevel gear and a winding drum. Through a linkage structure of the cleaning device and the dynamic twisting device, synchronous synergy of copper wire cleaning, tension control and uniform nickel plating is achieved, a copper wire can rotate by 360 degrees when penetrating through a nickel plating hole in real time, the binding force of a plating layer and a copper base body is improved, the problems that cleaning is not thorough and nickel plating is not uniform in a traditional technology are solved, and the production efficiency is improved. According to the utility model, the resistance to salt spray corrosion of the conductor is prolonged, the harsh standard of a high-speed rail is met, and accurate cooperation of twisting and winding and adaptation of conductors of multiple specifications are realized through traction sheave synchronous transmission and a self-adaptive positioning device.

This invention discloses a method for preparing rare earth metals by electrolytic oxides using a fluoride system, belonging to the field of rare earth metal preparation technology. This invention modifies graphite anodes used in rare earth molten salt electrolysis. It improves oxidation and corrosion resistance, reduces anode wear, lowers replacement frequency, and increases production efficiency, yielding high-purity, low-carbon rare earth metal lanthanum. A three-dimensional network framework material is constructed using Prussian blue self-assembly and SiC is deposited to obtain a composite framework material. During pre-calcination with graphite and other materials, the derivatives optimize the crystal structure and interfacial bonding, enhancing the strength of the pre-shaped anode material and ensuring the integrity and performance stability of the electrode structure. Thirdly, the pre-shaped anode material is impregnated with a specific impregnation solution, altering the gas diffusion path and resistance, inhibiting oxidation reactions, and high-temperature sintering generates substances that fill the pores, forming a dense microstructure. Simultaneously, the compounds formed by phosphoric acid enhance cohesion and adhesion, improving oxidation and molten salt corrosion resistance, and extending the service life of the graphite anode.

The utility model provides a high-temperature-resistant wide-mouth bottle, which relates to the technical field of wide-mouth bottles, and comprises a bottle body and a reinforcing assembly arranged on the inner side of the bottle body, the reinforcing assembly comprises a pressure-resistant assembly arranged on the peripheral side of the bottle body and a pressure relief assembly arranged on the outer side of the end part of the bottle body, the pressure-resistant assembly is used for improving the high-temperature resistance of the bottle body, corrosion of high-temperature objects or liquid to the device can be effectively resisted through the first composite layer, the second composite layer and the third composite layer, the service life of the device is prolonged, compared with a container made of a traditional material, the applicability in the high-temperature and strong-corrosion environment is greatly improved, and the use is convenient. The heat insulation design of the second composite layer remarkably reduces heat loss, keeps the high-temperature environment in the bottle stable, and reduces energy consumption.

The invention belongs to the technical field of polyester recovery, and relates to a method for preparing BHET by catalyzing ethylene glycol alcoholysis of PET. According to the method, gamma-Fe2O3 (at) meso-SiO2-DBU is adopted as a catalyst, the gamma-Fe2O3 (at) meso-SiO2-DBU is composed of gamma-Fe2O3 (at) meso-SiO2 and DBU, the gamma-Fe2O3 (at) meso-SiO2 is of a core-shell structure, the core is gamma-Fe2O3, the shell is composed of meso-SiO2, the DBU and the shell form ion pairs through electrostatic attraction, and the ion pairs are enriched in mesopores of the meso-SiO2. The problem that the yield of BHET is low in an existing magnetic separation heterogeneous catalysis system is solved, the conversion rate of PET and the yield of BHET are effectively increased, and the catalyst is stable in structure and lasting in catalytic activity, can be magnetically separated and recycled and adapts to the strict reaction conditions for catalyzing ethylene glycol to depolymerize PET.

The utility model discloses a refractory brick, which belongs to the technical field of refractory bricks, and adopts the technical scheme that the refractory brick comprises a first brick body, a convex block is arranged on the front side of the first brick body, a second brick body is arranged on the front side of the first brick body, the surface of the convex block is clamped with the inner wall of the second brick body, and the first brick body comprises a base layer; a buffer layer is arranged on the surface of the base layer, a heat insulation layer is arranged on the surface of the buffer layer, a wear-resistant layer is arranged on the surface of the heat insulation layer, and an erosion-resistant layer is arranged on the surface of the wear-resistant layer, so that the problems that the mounting efficiency is low and the mounting precision is difficult to guarantee due to the lack of an effective positioning structure when existing refractory bricks are used are solved. Meanwhile, the problems that the brick body is easily damaged due to stress concentration in the actual use process, the structure of the brick body is easily and seriously damaged after the brick body is eroded by high-temperature chemical substances, the brick body is difficult to stably work for a long time under complex working conditions, and the service life is short are solved.

The utility model relates to display equipment technical field especially LED packaging structure and display device, LED packaging structure includes wiring layer, with the LED chip of wiring layer electricity connection, the filling layer that sets up around LED chip, set up in the sapphire layer that LED chip far away from wiring layer one side and LED chip are pasted, LED packaging structure still includes the fluorescent layer that sets up around filling layer and sapphire layer, fluorescent layer sets up around filling layer and sapphire layer, realizes spectrum conversion, when the blue light that LED chip emits irradiates on fluorescent layer, fluorescent layer absorbs part blue light and emits other color light, and the white light that mixes with blue light is obtained to realize MIP white light product, make the light that emits from LED packaging structure more uniform, improve illumination quality and visual comfort.

The application provides a nuclear fuel grid micro-oscillation fatigue failure evaluation method, and relates to the technical field of nuclear fuel grids, and comprises the following steps: obtaining an elastic wave signal and a normal clamping force of the nuclear fuel grid, then removing noise information in the signal to extract a pure high-frequency micro-oscillation impact signal, combining the normal clamping force to construct a time-domain load spectrum, calculating fatigue damage according to the load spectrum, and judging whether the grid fails or not. Through effective noise reduction and feature extraction on the elastic wave signal in a strong noise background, the real time-domain characteristics of the micro-oscillation impact can be accurately restored, so that the key time node of the transition of the contact surface from adhesion to sliding can be accurately positioned, the accuracy and reliability of the nuclear fuel grid micro-oscillation fatigue failure evaluation are significantly improved, the traditional offline estimation is realized to the full life cycle online evaluation based on the real dynamic load, and the structural integrity of the nuclear fuel assembly under the long-term service condition is effectively ensured.

This application relates to the field of biomedical engineering, specifically disclosing a stem cell preparation for treating acute ischemic stroke and its preparation method. The preparation comprises a carrier core formed integrally through membrane fusion and an engineered stem cell membrane shell. The carrier core is a homologous stem cell exosome loaded with reactive oxygen species (ROS) scavenging nanoenzymes and can anchor responsive hydrogel microspheres encapsulating neurotrophic factors. The engineered shell covers the core, and its surface is covalently linked to brain-targeting molecules and thermosensitive lipid molecules, the latter of which can expose the target molecules at body temperature for intelligent navigation. The preparation method includes stepwise preparation of the drug-loaded core and functionalized shell, followed by programmed freeze-thaw treatment to induce membrane fusion of the two into a complete preparation. The product of this application can efficiently target ischemic lesions and achieve sequential synergistic treatment by first scavenging ROS and then releasing trophic factors. Its preparation method has advantages such as modularity, mild conditions, and good preservation of bioactivity.

This invention discloses a high-safety, high-energy-density chalcogenide all-solid-state battery and its preparation method, belonging to the field of all-solid-state battery technology. The battery includes a positive electrode, a chalcogenide solid electrolyte layer, and... SnF2‑In The phase change alloy thermal response layer and negative electrode have a thermal response layer thickness of <5μm, coated only on the outer periphery of the battery and the interface between adjacent batteries. Its operating initiation temperature is 50-100℃ higher than the high-temperature, high-pressure sintering temperature of 570℃. This invention achieves a 99.2% volumetric energy density retention rate by precisely defining the coating area, thickness, and temperature matching relationship of the thermal response layer. The early expansion rate of the thermal response layer after sintering is controlled at 4.8%, the probability of preventing thermal runaway chain propagation between adjacent batteries reaches 95.0%, and the thermal conductivity is reduced by 83% compared to structures without a barrier layer. While ensuring composite safety functions, it does not compromise the core commercial advantages of all-solid-state batteries, and has broad industrialization prospects.

The invention discloses a special water cooling system for large carbon block production, which belongs to the technical field of carbon block production, and comprises a cooling water tank for water cooling of carbon blocks; the supporting frame assembly is arranged on the peripheral side of the upper portion of the cooling water pond in a crossing mode, and a hoisting component is arranged over the cooling water pond and located on the supporting frame assembly; the U-shaped lifting platform is hoisted above the cooling water tank in a horizontal state, and a bearing platform plate used for bearing carbon blocks is fixed to the inner bottom wall of the U-shaped lifting platform; and the bottom hoisting end of the hoisting part is fixedly connected with the top surface of the U-shaped lifting table to hoist the carbon block in the U-shaped lifting table, so that the carbon block in the U-shaped lifting table can be hoisted into cooling water in the cooling water tank, and water cooling is realized. According to the invention, the carbon block is ensured to be completely immersed in the cooling medium, uniform and sufficient heat exchange is realized, and the cooling quality and the product yield are obviously improved.

The utility model relates to the technical field of section steel bending and correcting equipment, in particular to section steel bending and correcting equipment which comprises a bottom plate, a temperature control electric heating ring and a supporting frame which are fixedly installed on the bottom plate, an air cylinder is fixedly installed on a top plate body of the supporting frame, and a steel plate is fixedly installed at the tail end of a telescopic shaft of the air cylinder. A correcting pressing head is detachably installed on the bottom face of the steel plate, a supporting table is arranged under the correcting pressing head, the supporting table is fixedly installed on the bottom plate, inner grooves are formed in the left side and the right side of the supporting table, a machining table top is arranged on the top face of the supporting table, and a lower pressing die is detachably installed on the top face of the supporting table. The correction device is convenient for correction operation after heating, and has the advantage of ensuring that the correction process is carried out stably.

The application provides a new type of gasket material for intelligent self-lubricating joint bearings and a preparation method and application thereof, and belongs to the technical field of composite materials, self-lubrication and intelligent monitoring, in particular, the preparation method of the new type of gasket material for intelligent self-lubricating joint bearings comprises the following steps: S1: preparing a conductive synergistic material; S2: preparing a modified performance reinforcing material; S3: preparing a phenolic resin diluent; S4: preparing a conductive modified phenolic resin adhesive film; S5: preparing an insulating modified phenolic resin adhesive film; S6: preparing a pretreated fabric; and S7: preparing a new type of gasket material. The new type of gasket material for intelligent self-lubricating joint bearings prepared by the above method can realize the integration of "material-function", intelligently monitor the wear state of the bearing according to the step change of the electrical conductivity, has the advantages of excellent friction-reducing and wear-resistant performance and high sensitivity, can significantly simplify the structure of the bearing system and reduce the maintenance cost, and is suitable for the fields of aerospace and the like.

The utility model relates to a kind of assembled conductive copper bar structure, specifically a kind of assembled high load flow distribution's conductive copper bar structure, including assembling seat, two sides on the assembling seat are provided with slot, the side of the assembling seat is provided with fixed seat and the holding plate of the side of the fixed seat, copper bar body is provided between the assembling seat and fixed seat, adjusting mechanism and the limiting fastening mechanism for being used to the assembling of copper bar body are provided in the assembling seat, the adjusting mechanism is cooperated with the transmission mechanism of the side of the fixed seat, the utility model is inserted into the cooperation between the assembling seat and fixed seat, realize the way of inserting into to the superposition fixed of multilayer copper bar, need not be on copper bar hole for bolt fixed, effectively simplify installation and dismounting process, avoid the copper bar structure strength weakening and stress concentration problem possibly caused by hole simultaneously, guarantee the structural integrity and mechanical properties of copper bar.

The utility model discloses a buffering assembly and a vehicle. The buffering assembly comprises a first buffering piece, a second buffering piece and an inner sleeve. A first through hole is formed in the first buffer piece; the second buffer part is provided with a second via hole, the second buffer part is connected with the first buffer part, the first via hole is communicated with the second via hole, and the peripheral surface of the first buffer part and the peripheral surface of the second buffer part are spaced to form a clamping groove; a fixing hole is formed in the inner sleeve, and the inner sleeve sequentially penetrates through the first via hole and the second via hole. By means of the scheme, the problems that the power distribution system is prone to damage, unstable in fixation, tedious in installation and the like in the installation process are solved, rapid and reliable installation of the power distribution system is achieved, the vibration resistance and the impact resistance of the power distribution system are effectively improved, and the safety and the stability of operation of the whole vehicle electric energy distribution system are further guaranteed.

This invention belongs to the field of vibration-damping friction pendulum bearing installation technology, and specifically relates to a precise positioning and installation device for building vibration-damping friction pendulum bearings. It includes a first arc-shaped fixing plate and a second arc-shaped fixing plate located on the circumferential wall of the lower bearing. It also includes: a fixing mechanism fixedly disposed between the two ends of the first and second arc-shaped fixing plates; and four positioning seats symmetrically arranged in pairs on the side walls of the first and second arc-shaped fixing plates, with an arc-shaped moving mechanism between the positioning seats and the first and second arc-shaped fixing plates. This invention, through the coordinated operation of the lower positioning mechanism, upper positioning mechanism, height detection mechanism, and arc-shaped moving mechanism, combined with a PLC controller, achieves automated and precise positioning, levelness detection, and connection gap detection, significantly reducing installation deviations and repeated adjustments, protecting the core components of the bearing, improving installation efficiency and accuracy, and ensuring the seismic safety of buildings.

This application relates to the field of cable protection pipe technology, and in particular to a low-temperature impact-resistant CPVC cable protection pipe, which includes a protection pipe body, an insulation layer, and a circulation mechanism. An impact-resistant mechanism is fixedly connected to the inner side of the protection pipe body. A cable body is inserted through the insulation pipe body inside the impact-resistant mechanism. A heat exchange mechanism is fixedly connected to the outer surface of the insulation pipe body. The circulation mechanism is located at the top of the protection pipe. This technical solution, through its heat exchange, circulation, impact resistance, and heat recovery structure, combined with a composite insulation layer and a suitable heat exchange medium, efficiently absorbs solar energy and recovers waste heat from the cable, continuously insulating the protection pipe body day and night, resisting external impacts, preventing low-temperature embrittlement and cable overheating, adapting to different low-temperature environments, reducing heat loss and energy consumption, and solving the problems of existing CPVC cable protection pipes such as poor resistance to low temperatures, weak impact resistance, and limited adaptability.

The application relates to the technical field of batteries and discloses a battery cell and a battery pack. The battery cell comprises a shell, an open end of the shell, a pole group arranged in the shell, the pole group comprising a positive pole sheet, a diaphragm and a negative pole sheet arranged in layers, the diaphragm extending out of the upper side walls of the positive pole sheet and the negative pole sheet, a battery cell cover plate assembly comprising a cover plate and a lower plastic, the cover plate being arranged on the open end, the lower plastic being arranged on the lower surface of the cover plate and in the shell, the lower surface of the lower plastic being provided with a separation part and a pair of limiting parts, the pair of limiting parts being respectively arranged at opposite ends of the lower surface of the lower plastic, the separation part being arranged between the pair of limiting parts, the end area of the separation part away from the cover plate being smaller than the end area of the limiting part away from the cover plate, the length of the separation part being smaller than the length of the limiting part, and the separation part and the limiting part both abutting against the part of the diaphragm extending out of the positive pole sheet and the negative pole sheet. The compression amount of the separation part on the diaphragm is reduced, and the possibility of damage of the separation part to the pole group is reduced.

This application relates to the field of hydrogen storage container technology, and discloses an integrated cryogenic high-pressure hydrogen storage container for unmanned aerial vehicles (UAVs) and its manufacturing method. The hydrogen storage container comprises, from the inside out: a metal inner liner structure for forming a hydrogen storage cavity; a composite material pressure-bearing layer covering the outside of the metal inner liner structure; a non-vacuum closed-cell foam layer filling and covering the outside of the composite material pressure-bearing layer; and a composite material outer shell covering the outside of the non-vacuum closed-cell foam layer. The composite material pressure-bearing layer, the non-vacuum closed-cell foam layer, and the composite material outer shell constitute an integrated sandwich structure. The non-vacuum closed-cell foam layer serves as the core material of the integrated sandwich structure and is configured to simultaneously provide thermal insulation and impact resistance. The technical solution provided by this application can meet the requirements of high-pressure bearing, cryogenic thermal insulation, lightweighting, and impact protection under non-vacuum conditions, and is suitable for cryogenic high-pressure hydrogen storage applications in UAVs.

The invention discloses a nodular cast iron micro-jacking pipe containing a polyurethane composite layer and a preparation process of the nodular cast iron micro-jacking pipe, and relates to the technical field of micro-jacking pipes, the micro-jacking pipe comprises an outer glass steel pipe and an inner nodular cast iron pipe, and further comprises a polyurethane thermal insulation material filled in an annular space defined by the nodular cast iron pipe and the glass steel pipe, the outer side of the nodular cast iron pipe is sleeved with multiple layers of cylindrical reinforcing meshes at intervals in the radial direction, meshes of the reinforcing meshes and gaps between the layers in the annular space are filled with the polyurethane heat preservation materials, and the polyurethane heat preservation materials and the reinforcing meshes form an integrated composite layer. According to the preparation technology, an outer-layer mold is adopted to replace a glass reinforced plastic pipe to serve as a forming constraint structure of a polyurethane composite layer, damage to the glass reinforced plastic pipe in the foaming process of a polyurethane thermal insulation material can be avoided, the polyurethane composite layer can be tightly wrapped by utilizing relatively mild contractility generated when the glass reinforced plastic material is cured, the attaching degree between the layers is improved, and the thermal insulation performance of the polyurethane thermal insulation material is improved. The overall design meets the requirements of structural stability and light weight.

The application provides a medium-nickel ternary precursor, a preparation method and a positive electrode material. The preparation method of the medium-nickel ternary precursor comprises the following steps: (1) first seeds with a median particle size D50 of 0.5-1 mu m and second seeds with a median particle size D50 of 2-3 mu m are prepared by a coprecipitation method; (2) the first seeds are used, and a ternary metal salt solution, a precipitant solution and a complexing agent solution are fed in parallel to perform a first coprecipitation reaction to obtain an inner core; then the second seeds are used, and a second coprecipitation reaction is continuously performed to form a transition layer on the surface of the inner core; a third coprecipitation reaction is continuously performed to form an outer shell on the surface of the transition layer; and (3) the obtained product is filtered, washed and dried to obtain the medium-nickel ternary precursor. The positive electrode material prepared by the preparation method has the advantages that the lattice expansion and contraction stress under high voltage can be effectively buffered, microcracks and interface side reactions can be inhibited, and the positive electrode material has high compaction density and processing performance.

This invention discloses a ferrophosphate-based high-entropy glass-ceramic containing a high-entropy monazite phase and its preparation method, used for simultaneously solidifying multiple (minor)actinide nuclides in high-level radioactive waste (HLW). This invention uses five or more simulated (minor) actinide nuclides in equal amounts. Ln ( Ln =La, Ce, Nd, Sm, Eu, Gd, Dy, Ho, Er) simultaneously dissolve into the ceramic crystalline phase, forming a high-entropy monazite phase ( Ln 1 / n )PO4(5≤ n ≤7). The chemical formula of the solidified body is (100- x ()( y Fe2O3-(90- y (P₂O₅-10B₂O₃)-0.5 x P2O5−( x / 2 n ()( Ln 2O3)(mol%), x =0~30mol% y =15~35mol%. The raw materials are mixed according to the formula and then subjected to a one-step melt heat treatment method (melting, nucleation, crystallization) to obtain a solidified iron phosphate-based high-entropy glass-ceramic.

This invention discloses a dual-mode (BeiDou and UWB) collaborative positioning method for rail transit, specifically relating to the field of fusion positioning technology. The method includes the following steps: based on the spatial coverage status of the two types of signals along the train path, a cross-modal distortion discrimination array is constructed to identify trajectory abrupt change regions and dynamically adjust the signal fusion weights; abrupt change points are corrected using a constrained backtracking trajectory fitting algorithm, and pseudo-trajectory points are eliminated by combining the spatial topology of the positioning base station; time-series analysis is performed on the changes in signal fusion weights, and if frequent signal jump trends exist, the relevant fusion weights are lowered to the minimum tolerance threshold to improve trajectory continuity and positioning robustness. This invention achieves accurate identification of trajectory abrupt change regions by constructing a cross-modal distortion discrimination array, effectively corrects abnormal trajectory points by combining dynamic adjustment of fusion weights and a constrained backtracking trajectory fitting algorithm, and suppresses signal jump trends through a time-series analysis mechanism, thereby improving the stability of trajectory fusion and positioning accuracy.

This application relates to the field of etching solution technology, specifically disclosing a BOE etching solution and its preparation method. The BOE etching solution comprises the following raw materials: hydrofluoric acid, ammonium fluoride, a metal corrosion inhibitor, a composite buffer regulator, perfluorobutyl polyoxyethylene ether, and ultrapure water; the metal corrosion inhibitor is a complex of benzotriazole-imidazolium-grafted polyethyleneimine and aminotrimethylenephosphonic acid; the composite buffer regulator includes ammonium hydrogen fluoride, boric acid, and amino acids. The BOE etching solution of this application can be used in back-end metal wiring processes such as integrated circuits, MEMS devices, and 3D NAND, and is particularly suitable for etching silicon dioxide containing tungsten, aluminum, and titanium metals. It features high etching rate, low metal corrosion, and excellent metal surface protection, effectively solving the technical pain points of existing BOE etching solutions, such as severe metal corrosion and difficulty in simultaneously achieving etching and protection.

According to the point constraint automatic assembly mold for the nuclear fuel assembly grillwork, a stable installation foundation is provided for a clamp body through a first space in a mold frame, and the clamp body is provided with a plurality of first channels and second channels which are arranged in the first horizontal direction and the second horizontal direction in a crossed mode; the first strip and the second strip are contained in the first strip and the second strip respectively; a plurality of mounting cavities are formed in one side of each first channel, pressing structures are arranged in the mounting cavities in a one-to-one correspondence manner, and uniform pressing force can be applied to the first strip from the side direction under the synergistic effect of a driving structure; the structure fully adapts to the material characteristics of thin wall and weak rigidity of the nuclear fuel grillwork strip, not only effectively avoids the problems of strip indentation, scratch and deformation easily caused by a traditional rigid clamp, but also remarkably reduces the introduction of additional stress in the assembly process, thereby preventing the structure instability of the grillwork caused by stress release in the follow-up use, and improving the service life of the nuclear fuel grillwork. And the assembly quality, the structural integrity and the long-term service reliability of the nuclear fuel grillwork are comprehensively guaranteed.

The invention discloses a non-contact magnetic flux leakage internal detection device for a pipeline, and belongs to the technical field of pipeline detection. The device comprises a driving module, a universal connection module and a magnetic flux leakage detection module which are connected in sequence. An excitation unit of the magnetic flux leakage detection module is provided with a magnetization mechanism and a magnetic field signal acquisition mechanism, and the outer diameter enclosed by a magnetization assembly is smaller than the outer diameter of a supporting disc, so that non-contact excitation is realized. According to the non-contact magnetic flux leakage internal detection device for the pipeline, direct friction between an excitation structure and the inner wall of the pipeline is fundamentally avoided, damage to an inner wall coating or a body is effectively prevented, and the requirement for the smoothness of the inner wall of the pipeline is greatly reduced; the adaptability, passing ability and operation stability of the device to complex working conditions such as scaling and corrosion are improved, the signal quality is guaranteed through the self-adaptive attached signal collector, it is guaranteed that the device smoothly passes through a bent pipe section through the universal connecting module, and safe, stable and high-integrity detection within the wide pipeline diameter range is achieved on the whole.