17results about How to "Good size control" patented technology

This invention provides a wireless, passive force-position implantable growth monitoring system and its fabrication method for early-onset scoliosis correction. The system includes: a connected compressible capacitive sensor and a flexible wireless antenna coil; the compressible capacitive sensor is connected to a self-growing early-onset scoliosis correction implant growth rod, and the flexible wireless antenna coil is disposed within the body. The compressible capacitive sensor and the flexible wireless antenna coil together constitute an LCR resonant circuit; the compressible capacitive sensor monitors the pressure changes caused by the elongation of the self-growing early-onset scoliosis correction implant growth rod during tissue or bone growth, thereby causing changes in capacitance and resulting in changes in the resonant frequency of the LCR resonant circuit; the resonant frequency change is detected and read out wirelessly via an external readout device. This system is designed to meet the needs of digital rehabilitation, requires no internal power supply, and has a stable structure, making it suitable for growth monitoring after early-onset scoliosis correction surgery.

This invention discloses a method for preparing van der Waals metal thin films. The method includes the following steps: S1, coating a polyvinyl alcohol (PVA) film onto the surface of a supporting substrate; S2, depositing a metal film on the surface of the PVA film to obtain an intermediate; S3, placing the intermediate in water at 60-80°C to remove the PVA film, obtaining a floating metal film; transferring the metal film to the surface of a target substrate, and bonding the two together using van der Waals forces to obtain the final product. This invention utilizes the controllable dissolution properties of PVA, achieving the separation and transfer of the metal film from the supporting substrate using deionized water, avoiding the use of toxic chemical solvents and interface damage caused by high-energy bombardment. The method is simple, environmentally friendly, and can be widely applied to the preparation of van der Waals heterostructures such as metal-semiconductor and metal-insulator structures.

This invention discloses a core structure for a highly reliable electronic gear shifter, including a bracket, side plates, a toothed plate, and a shifting assembly. The shifting assembly includes a left shift block, a shift lever, a right shift block, steel balls, a locking plate, a locking spring, a gear position spring, and a sleeve. The shift lever is clamped and fixed by the left and right shift blocks. The cylindrical boss of the left shift block is tightly fitted with the inner hole of the large bearing, and the pin hole of the right shift block is tightly fitted with a pin, which is also tightly fitted with the inner hole of the small bearing. The locking spring and locking plate slide within the inner cavities of the left and right shift blocks, the steel balls and gear position spring move within the inner hole of the sleeve, and the steel balls and locking plates are slidably connected to the toothed plate. The unlocking lever slides within the shift lever. This invention enhances the shifting operation feel, increases the service life of the gear shifter, improves the strength and structural reliability of the gear shifter, and the locking function avoids the risk of misoperation.

The application discloses a kind of high-performance magnesium-lithium alloy materials, the high-performance magnesium-lithium alloy material is obtained by being compacted by magnesium-lithium alloy powder into mould, then sintering densification is carried out, in addition, the application also provides a kind of preparation method of high-performance magnesium-lithium alloy material, comprising the following steps: one, Mg-8Li-9Al-1Zn alloy powder is weighed and loaded into mould;Two, the powder in the powder loaded mould is compacted;Three, the mould with compacted powder is sintered densification in vacuum, and high-performance magnesium-lithium alloy material is obtained in mould.The high-performance magnesium-lithium alloy material of the application uses Mg-8Li-9Al-1Zn alloy powder as raw material, is compacted by being loaded into mould, then sintering densification is carried out, process flow is short, cost is low, operation is simple, flexible, the obtained high-performance magnesium-lithium alloy material component is uniform, organization is small, and the organization, structure of material can be designed, easily controlled, and the compressive strength is greater than 500MPa.

The application discloses a kind of assembled friction type holographic energy dissipation damping structures with tenon-mortise structure at component end, including prefabricated frame beam slab column, holographic substructure prefabricated beam column, prefabricated beam column node connector, substructure prefabricated beam column node connector, beam end tenon-mortise connector, beam interconnection and plate beam connection tenon-mortise structure.Prepared frame beam slab column is connected by prefabricated beam column node connector, beam end tenon-mortise connector and plate beam connection tenon-mortise, modularization is conveniently installed, and beam end friction deformation and bending energy dissipation are simultaneously enhanced.Holographic substructure prefabricated beam column is connected by substructure prefabricated beam column node connector, and substructure beam is connected with main body prefabricated beam middle section by beam interconnection, under the action of multi-dimensional excitation of building structure system, substructure is first energy dissipation, and the damage of excitation to main body structure is reduced.The holographic energy dissipation damping structure is prefabricated in factory, quality is controllable, installation is convenient, and construction period and budget are greatly reduced.

The application discloses a synthesis method of rare earth borate nanoparticles, which comprises the following steps: heating a boron precursor in a nitrogen atmosphere, then rapidly injecting a rare earth metal precursor, rapidly heating to 280-310 DEG C and maintaining for a period of time to form uniform rare earth borate nanoparticles; wherein the rare earth metal precursor is an organic solution containing rare earth acetate hydrate and oleic acid; and the boron precursor is an organic solution containing tributyl borate. The application firstly innovatively improves the synthesis method of rare earth borate nanoparticles, prepares regular morphology and uniform size neodymium borate nanoparticles, and after optical performance characterization, it is shown that the neodymium borate nanoparticles have the potential for BNCT used for near-infrared two-zone imaging guidance. The preparation method can realize the size control of the neodymium borate nanoparticles by adjusting the proportion of the neodymium precursor and the boron precursor, and is suitable for the preparation of various rare earth borate nanoparticles, and the method has universality.

The application discloses a kind of synthesis method of spherical polymer nanoparticles, it is related to vaccine technical field, and the method comprises the following steps: polyvinylpyrrolidone is dissolved in mixed solvent, then glyoxal, ascorbic acid and ethylenediamine are added in turn respectively, after stirring for a certain time, the color of solution obviously changes from yellowish to wine red.The solution containing prepolymer is transferred into reaction kettle, the reaction kettle is put into oven to react, the previous prepolymer will further crosslink and polymerize, form nonlinear network polymer skeleton, through repeated centrifugation and ethanol washing, finally drying can obtain the target spherical nanoparticle material.The application uses ascorbic acid as raw material, ethylenediamine as initiator and connecting agent, glyoxal as crosslinking agent, successfully synthesizes a kind of brand-new polymer nanoparticle, simultaneously realizes efficient antigen delivery and specific activation B cell, and is a kind of brand-new ideal vaccine adjuvant with promising application.

This invention belongs to the field of catalytic ammonia oxidation technology, and specifically relates to a Ru / AMn2O4 catalyst for the gas-solid phase synthesis of methacrylonitrile, its preparation method, and its application. The catalyst preparation includes the preparation of an AMn2O4 spinel support, AMn2O4 spinel support pretreatment, and Ru / AMn2O4 catalyst preparation. The catalyst of this invention, prepared by the above method, possesses advantages such as high activity at low temperature, high stability, high conversion rate of methacrolein, high yield of methacrylonitrile, and low yield of the byproduct hydrogen cyanide. It is particularly suitable for use as a catalyst in the gas-solid phase ammonia oxidation of methacrolein to methacrylonitrile.

The application provides a semiconductor structure and a preparation method thereof. The semiconductor structure comprises a lead frame, a first chip, a second chip, a first conductive clip, a second conductive clip and a plastic package. The lead frame comprises a base island having a first surface and a second surface facing away from each other; the first chip is arranged on the first surface of the base island; the second chip is arranged on the second surface of the base island; at least part of the first conductive clip is arranged on a side of the first chip facing away from the base island, and is used for electrically leading out the first chip; the second conductive clip is arranged on a side of the second chip facing away from the base island, and is used for electrically leading out the second chip; the plastic package encapsulates the first chip, the second chip, part of the lead frame, part of the first conductive clip and part of the second conductive clip; and a side of the second conductive clip facing away from the base island is exposed from the plastic package.

This utility model discloses a photographic apparatus, comprising a sensing module and a control module. The sensing module includes a housing, a first circuit board, and a sensor. The housing includes a first support. The first circuit board is disposed on the first support. The sensor is disposed on the first circuit board and configured to perform optical image capture. The control module includes a second support and a circuit board assembly. The circuit board assembly is connected to the second support and includes multiple second circuit boards and multiple first flexible connectors. The multiple second circuit boards are stacked and electrically connected via the multiple first flexible connectors. The photographic apparatus also includes second flexible connectors electrically connected between the sensing module and the control module, wherein a module spacing is formed between the sensing module and the control module.

The application discloses an ion cage connected covalent organic framework compound and a preparation method and application thereof. The preparation method comprises the following steps: mixing an iron source, an oxime base derivative, a boric acid base derivative, a first solvent and a second solvent, and performing a liquid nitrogen freezing-pump air extraction-freezing cycle degassing treatment, then sealing and performing a condensation reaction to prepare a metal chelate connected covalent organic framework compound; and performing acid treatment on the metal chelate connected covalent organic framework compound to prepare the ion cage connected covalent organic framework compound. The preparation method provided by the application has the advantages of easy raw material, mild conditions, simple operation, and the like, and the prepared covalent organic framework compound has a clear cavity structure and a periodic arrangement of coordination sites, exhibits excellent chemical stability and regular channel characteristics, and has a wide application prospect in the fields of ion adsorption separation, heterogeneous catalysis and the like.

This disclosure provides a transition section structure, a combustion chamber testing apparatus, and a combustion chamber testing method. The transition section structure sequentially comprises a first pipe section and a second pipe section along the X direction. Along the X direction, the first pipe section sequentially comprises a first inlet end, a gradually expanding pipe section, and a first outlet end; the second pipe section sequentially comprises a second inlet end, a contracting wall surface, and a second outlet end. The flow channel cross-section of the gradually expanding pipe section gradually expands along the X direction; the contracting wall surface contracts inwards perpendicular to the X direction; the first inlet end provides a first flow channel cross-section; the first outlet end and the second inlet end are fixedly connected and provide a circular flow channel cross-section; the contracting wall surface and the second outlet end provide a second flow channel cross-section; the first flow channel cross-section and the second flow channel cross-section have definite shapes, and the shapes of the first flow channel cross-section and the second flow channel cross-section are different.

The invention belongs to the technical field of nano material preparation, and particularly relates to a method for preparing a few-atomic-layer ultrathin SnSe nanosheet based on an intercalation compound precursor. The invention discloses a method for preparing a low-atomic-layer ultra-thin (lt; lt) material by taking ethanolamine as an intercalator based on an intercalation-de-intercalation strategy. According to the method, ethanol amine is used as an intercalator through a hydrothermal method, an ethanol amine intercalated SnSe hybrid precursor is firstly synthesized, then the ultrathin SnSe nanosheet is obtained through deintercalation treatment, the thickness of the prepared nanosheet can reach the atomic level (about 2-3 atomic layers), and the method is simple in process, low in cost, high in product quality and suitable for industrial production. The problems that an existing process is complex, and product size and thickness are difficult to control are solved. In addition, the ultrathin SnSe nanosheet prepared by the method shows excellent application prospects in the fields of piezoelectric devices, photoelectric detection, flexible electronics, energy conversion and the like.

This invention discloses a method for preparing yttrium-magnesium oxide (YMO) multiphase transparent ceramics using non-aqueous gel casting, belonging to the field of ceramic preparation technology. To overcome the problems associated with water-based gel casting, this invention provides a method for preparing YMO multiphase transparent ceramics using non-aqueous gel casting, comprising: ball milling Y2O3, MgO, a dispersant, and a non-aqueous solvent; then adding epoxy resin and a curing agent and ball milling again; the resulting ceramic slurry is defoamed, cured, and dried; then subjected to debinding, sintering densification, cooling, hot isostatic pressing, annealing, and polishing to obtain the YMO multiphase transparent ceramic. This invention overcomes the difficulties in preparing large-size Y2O3-MgO nano-multiphase infrared transparent ceramics and the problem of component inhomogeneity by designing a non-aqueous solvent system and selecting a suitable gel system, and can produce complex-shaped / large-size, uniformly composed YMO nano-multiphase ceramics.

The invention discloses a 3D hepatotoxicity test monodisperse microgel preparation method, a 3D hepatotoxicity test monodisperse microgel preparation system and a medium, and belongs to the technical field of 3D cell culture and drug screening. The system comprises a preparation module, a statistical analysis module, a material processing module and a control system, the method comprises the following steps: collecting historical data to train an adaptive neural network, and establishing a mapping relation between control parameters and microgel quality indexes; a neural network is used as a prediction model, and optimal control input is solved through a model prediction controller; performing microgel preparation; acquiring images in real time to obtain and feed back actual particle sizes and variation coefficients; applying the new data to incremental updating of the neural network; and performing iteration to form a closed-loop optimization process. According to the method, multi-parameter self-adaptive optimization is realized through an artificial intelligence algorithm, the problem of manual exploration of parameters of different hydrogel materials is solved, the monodispersity and consistency of microgel are improved, and full-process automation is realized.

A copper-iron co-fired inductor and its preparation method are disclosed. The copper-iron co-fired inductor comprises: a square magnetic core, the surface of which is covered with an insulating layer; two flat copper wires, which are arranged parallel to each other on the surface of the magnetic core covered with the insulating layer and adhere to three adjacent faces of the square magnetic core, with the ends of the flat copper wires extending to adhere to a fourth face of the square magnetic core; and a shielding layer, which is adhered to the three surfaces of the square magnetic core with the flat copper wires attached, and is pressed together with the square magnetic core, the insulating layer, and the flat copper wires to form an integrated blank. The blank is then co-fired and sintered to form the copper-iron co-fired inductor. The present invention also provides a method for preparing the copper-iron co-fired inductor. The copper-iron co-fired inductor of the present invention, through the design of the aluminum nitride insulating layer, parallel flat copper wires, and iron-silicon-aluminum shielding layer, greatly improves heat dissipation performance.