11results about How to "Avoid structural changes" patented technology

The invention provides a stem cell extract composition for promoting hair growth and a preparation method thereof, and belongs to the technical field of cosmetics. Fetal calf serum, dexamethasone, penicillin, streptomycin, interleukin-2 and magnetic composite particles are added into a DMEM culture medium to prepare the culture medium, the culture medium is used for in-vitro culture of stem cells, during culture, a stem cell solution is prepared by combining a low-frequency magnetic field with low-energy laser culture, exosomes are extracted from an extracting solution, the exosomes and the stem cells are mixed and embedded to prepare embedded microspheres, and the embedded microspheres are used for in-vitro culture of the stem cells. The stem cell extract composition for promoting hair growth is prepared by uniformly mixing the stem cell extract with extracts extracted from fresh ginger, ginseng and polygonum multiflorum, the storage stability of stem cells and exosomes is obviously improved, hair growth is promoted, hair follicle development is promoted, mouse hair is induced and maintained in a growth period, and the stem cell extract composition is free of hormone addition, safe and non-irritant, and has a good application prospect. Wide application prospects are realized.

The utility model relates to an unmanned plane technical field especially is related to a quick -mounting type unmanned plane landing gear charging communication adaptation device, solved unmanned plane landing gear recovery kit installation complex or need to carry out the irreversible structural modification to landing gear, reduce the technical problem of structural stability, it includes T type unmanned plane landing gear assembly, charging communication module, landing gear transverse stiffener group and landing gear wheel body assembly. Through the modularization quick -mounting design, the device need not to carry out destructive processing to unmanned plane original landing gear, can realize the efficient integration of charging and communication function. The present application can significantly improve the installation convenience, keep landing gear original mechanical strength, satisfy the demand of quick deployment and nimble replacement in unmanned plane automatic operation, ensure accurate positioning and stable charging communication simultaneously, provide reliable technical support for unmanned plane hangar and other automatic equipment.

The present invention proposes a fat stem cell composition for wound repair and a preparation method and application thereof, which belongs to the field of stem cell technology. Fetal bovine serum, dexamethasone, penicillin, streptomycin, collagen, magnetic particles, and substance P are added to DMEM culture medium to prepare a culture medium for low-frequency magnetic field culture of fat mesenchymal stem cells, separation, obtaining a stem cell solution, embedding to obtain stem cell microspheres, freeze-drying the supernatant to obtain paracrine culture material, and mixing with stem cell microspheres, hydroxypropyl methylcellulose, carboxymethyl chitosan, hyaluronic acid, glycerol, and stem cell microspheres to obtain a fat stem cell composition for wound repair, which has good effects of implanting damaged tissues, releasing nutrients, promoting new blood vessel formation, regulating oxidative stress and inducing anti-inflammatory reactions, and is helpful for wound repair. It can be converted into a gel phase at a skin epidermal temperature between 35-37°C, stabilizes components, and releases in a controlled manner.

The invention belongs to the field of preparation of chemical products, and particularly relates to a method for preparing high-purity magnesium sulfate. The preparation method comprises the following steps: grinding dolomite, calcining, soaking in a magnesium chloride solution, preparing a porous graphene film with high adsorption capacity by utilizing a laser treatment and plasma etching technology, and purifying magnesium sulfate. In order to solve the problems that in the prior art, magnesium sulfate prepared from dolomite as a raw material contains impurities such as calcium and iron, the purity is low, and the high-purity requirement of downstream industries cannot be met, the invention provides a method for preparing high-purity magnesium sulfate. The adsorption effect is achieved in the process of preparing magnesium sulfate from magnesium oxide, the purity of the obtained magnesium sulfate product is guaranteed, and it is guaranteed that the magnesium sulfate product is not lost in the adsorption process.

The invention provides a method for cleaning and drying a silica gel adsorption film of a semiconductor wafer, which comprises the following steps of: (1) cleaning the silica gel adsorption film of the semiconductor wafer by using alcohol, and then cleaning by using a surfactant; (2) after ultrapure water is used for cleaning the semiconductor wafer silica gel adsorption film, isopropanol is used for fourth cleaning; and (3) sequentially carrying out preheating treatment, one-step drying treatment and two-step drying treatment on the semiconductor wafer silica gel adsorption film obtained in the step (2) to obtain the dried semiconductor wafer silica gel adsorption film. By means of the cleaning and drying method, impurities on the semiconductor wafer silica gel adsorption film can be effectively removed, moisture on the surface of a semiconductor wafer silica gel adsorption film product can be effectively removed in the drying process, the structure stability of the semiconductor wafer silica gel adsorption film is guaranteed, and meanwhile the service life of the semiconductor wafer silica gel adsorption film product is prolonged. And the surface dryness of a semiconductor wafer silica gel adsorption film product is well maintained.

The invention relates to the technical field of batteries, and provides a positive electrode material and a preparation method thereof, a positive electrode plate and a secondary battery, the positive electrode material comprises an inner core and a porous coating layer at least coating the surface of the inner core, and the porous coating layer comprises a first coating layer and a second coating layer which are sequentially laminated from the surface far away from the inner core. The structural stability and the cycle performance of the positive electrode material can be improved.

This invention provides an ophthalmic composition for the treatment and / or prevention of visual disorders caused by changes in the eye's lens structure, particularly related to the alteration of the proteins that form the lens. The ophthalmic composition consists of a polyphenolic compound in combination with a terpenoid, or its salts or crystalline forms, in therapeutically effective amounts, requiring low doses of bioactive compounds to treat the disease through a reduced number of applications. Specifically, the ophthalmic composition of the invention may be employed for the treatment and reversal of visual disorders caused by alterations in the structure of the crystalline lens, such as cataracts, by being able to reverse the opacity of the lens caused by the disease.

The present invention relates to the field of biological experiment material grinding, and discloses a biological experiment material grinding device, including a grinding box, a box cover overlapped on the top of the grinding box, a controller fixedly arranged on the top of the box cover, a pull-out grinding box, the pull-out grinding box is installed inside the grinding box and is used to place the ground biological experiment material, and a grinding component is installed inside the grinding box and is used to grind the biological experiment material. Compared with the prior art, the present application rotates grinding discs of different roughness according to the water content in the biological experiment material, which can prevent the biological experiment material from being ground into mud and adhering to the grinding disc, and can grind bones into particles by using a grinding disc with high roughness, and can also reduce the heat generated by grinding and damage to the protein structure of biological tissue, so that the biological experiment material grinding device can be suitable for grinding materials in different biological experiment fields.

The present invention belongs to the field of chemical product preparation, and particularly relates to a method for preparing high-purity magnesium sulfate. The present application prepares a porous graphene film with high adsorption capacity by grinding, calcining and immersing dolomite in a magnesium chloride solution, and purifies the magnesium sulfate by using laser processing and plasma etching technology. The present application is to solve the problem that the magnesium sulfate prepared from dolomite as a raw material in the prior art contains impurities such as calcium and iron, and the purity is low, which cannot meet the high purity requirements of downstream industries. The present application provides a method for preparing high-purity magnesium sulfate. The present application uses laser processing to generate graphene on a polyimide sheet, which plays an adsorption role in the process of preparing magnesium sulfate from magnesium oxide, which not only ensures the purity of the obtained magnesium sulfate product, but also ensures that the magnesium sulfate product is not lost during adsorption.

This document discloses an implantable therapeutic delivery system, a method for preparing the implantable therapeutic delivery system, and a method for using the implantable therapeutic delivery system. The system includes a hydrogel matrix and a membrane, the hydrogel matrix containing at least one therapeutic agent, and the membrane partially or completely encapsulating the hydrogel matrix. The membrane comprises a nitinol mesh-reinforced hydrogel or nanofiber material.

The present invention discloses a split-type adjustable spring preload shock absorber. A split-type adjustable spring preload shock absorber comprises a top cover plate, a bottom cover plate, a bottom plate and a compression spring, a compression spring is welded on the top of the bottom cover plate, and a second transmission rod is sleeved inside the compression spring, the top of the bottom cover plate is welded to the second transmission rod, an oil delivery groove is provided inside the second transmission rod, a bearing is welded on the top of the compression spring, a buffer rubber is slidably embedded on the top of the second transmission rod, third transmission rods are rotatably connected to the top of the second slide groove on both sides through a rotating shaft, and the bottom of the third transmission rod is slidably connected to the first slide groove provided on the top of the bottom plate. In the present invention, the lubricating oil is sprayed back to the second transmission rod through the oil delivery groove during the shock absorber operation process, which not only saves the use of lubricating oil, but also is beneficial to the life of the shock absorbing machinery. The overall structure is practical and effective, and will have broad development prospects in the future.