36results about How to "Controllable number" patented technology

The invention provides a biobrick, comprising MSCs, a core layer wrapping the MSCs and a shell layer encapsulating the core layer, wherein the core layer and the shell layer are independently prepared from a biodegradable material and the core layer contains an inducing factor capable of inducing differentiation of MSCs into osteoblasts or bone. The invention also provides another biobrick, comprising MSCs, a core layer wrapping the MSCs and a shell layer encapsulating the core layer, wherein the core layer and the shell layer are independently prepared from a biodegradable material and the core layer contains an inducing factor capable of inducing differentiation of MSCs into chondroblasts or cartilage. The invention further provides a method for preparing a composite structure containing bone and cartilage. The composite structure comprises the above-mentioned two biobricks. The invention also provides the composite structure containing bone and cartilage prepared by using the method.

The invention discloses a method for designing a mask plate of a V-shaped beam, which includes the following steps: Step 1. Based on the accurate orthogonal solution of the spatial paraxial wave equation in an elliptical coordinate system, an electric field expression of a V-shaped beam is deduced Formula V p ε ; Step 2, for the electric field expression V p ε Find the angle function, get angle (V p ε ), and with a blazed grating P 0 combined to get angle (V p ε )+P 0 ; Step 3, using the principle of computational holography to obtain the specific expression of the complex transmittance function of the mask plate of the V-shaped beam through computer coding: ; The mask plate described based on the complex transmittance function is the described V-beam mask. The mask plate designed by the invention can generate a V-shaped light beam in which each light lobe is V-shaped. The number of V-shaped light lobes is controllable, and the number is twice the order p. The light path structure is significantly simplified; thus, it has a very important application prospect in cell sorting technology.

The invention discloses a preparation method of fullerol. The preparation method comprises the following steps: (1) dissolving fullerene in an organic solvent, wherein the organic solvent is selected from an organic matter which is higher than water in relative density, immiscible with water and can dissolve fullerene; then, respectively putting fullerene C2n which is dissolved in the organic solvent, a hydroxylation reagent aqueous solution with appointed concentration and a phase transfer catalyst into a reactor and layering, wherein a water phase is in the upper layer while the organic solvent in the lower layer; (2) opening a reaction system without isolating air, and after continuously stirring for 10-72 hours at room temperature, stopping reaction; (3) separating liquids, after washing the organic solvent with water, recovering for later use, and recovering the solvent from the water phase to obtain a cured fullerol coarse product; and (4) refining the fullerol coarse product to obtain solid pure fullerol. The synthetic process disclosed by the invention is simple, efficient, convenient to operate and easy for scaled production, and the prepared fullerol shows a good electron paramagnetic spinning property.

The invention discloses a screening and separate storing system for an electrically-controlled rice precision hole direct sowing machine. The system comprises a count sensor, a main through pipe, a hole grain screening mechanism and a separate storing mechanism; the hole grain screening mechanism is installed at the lower end of a shell of the count sensor and composed of an outer shell, a screening stepping motor and screening blades, a collecting pipe is installed on one side face of the outer shell of the hole grain screening mechanism, and the collecting pipe leads to a collecting box; the separate storing mechanism is composed of an outer shell, a separate storing stepping motor and separate storing blades, the separate storing mechanism is installed at the lower end of the outer shell of the hole grain screening mechanism, and an upper end opening of the separate storing mechanism receives qualified rice grains from the hole grain screening mechanism. According to the screening and separate storing system for the electrically-controlled rice precision hole direct sowing machine, the problems that hole grains are not uniform, and empty holes exist are solved, the number of sown rice grains is controllable, and preparation is made for downward sowing.

A polymer-based carbon nanotube dispersing aid and its synthesis method and application. The polymer-based carbon nanotube dispersing aid is a pyrene-functionalized amorphous polystyrene homopolymer, and the structural formula is a polymer in which one end of the polystyrene main chain is capped by 0.9-1.05 pyrene units. The number average molecular weight is between 5,000 and 30,000, and the molecular weight distribution index is between 1.10 and 1.21. The anionic polymerization method was adopted to synthesize, and the reactive pyrene-containing compound was added in the late stage of styrene living polymerization, and methanol was used to terminate the reaction after the polymerization. The polymer-based carbon nanotube dispersing assistant of the present invention can significantly improve the dispersing ability of carbon nanotubes in common organic solvents, and can prepare a uniform dispersion liquid of high-concentration carbon nanotubes. The dispersion liquid can be used to prepare a styrene-based polymer (polystyrene or styrene-based copolymer) / carbon nanotube composite material in which carbon nanotubes are uniformly dispersed in a matrix resin.