31results about How to "Flexible length control" patented technology

The invention provides a method for synthesizing and assembling polymer microspheres based on an integrated micro-valve droplet control chip. The method comprises the following steps: a series of micro-droplets of polymer monomers are generated by the opening and closing of a program controlled micro-valve; under the illumination of ultraviolet, the micro-droplets are solidified to form microspheres; and the online assembly, bonding and release of the microspheres are realized in a downstream channel. The method has the following advantages: the length of assembled particles is controlled by the opening times of a single-circulation nickel micro-valve; the bonding angle of the microspheres is controlled by controlling the relative dimension of uniform microspheres and the channel; and the internal dimension and the composition sequence of the assembled particle are controlled by controlling the dimension and the composition of single microspheres.

The invention discloses a nerve axon stretching grower which consists of a culturing and stretching control system and a mechanical device, wherein the culturing and stretching control system comprises a cell culture box, an upper computer, a controller and a stepping motor; the mechanical device comprises a coupler which is connected with the stepping motor, a ball screw linear sliding table, a stretching connecting block, a cell stretching grower, a device supporting rack and a chassis; the controller is connected with and drives the stepping motor to rotate so as to drive the ball screw linear sliding table at one end of the coupler to generate displacement, and the cell stretching grower is fixedly arranged on the device supporting rack and is used for indirectly stretching nerve axons by virtue of the stretching connecting block which is fixedly arranged on the linear sliding table. Different input commands can be set by virtue of the controller so as to regulate the growing direction and speed of the nerve axons. In addition, electrode contacts can be plated on a stretching film and a bottom film and can be connected with a multichannel neural signal recording and stimulating system for recording neural signals of the nerve axons and selectively stimulating different sites.

The invention discloses a method for manufacturing a fiber cladding power stripper. The method comprises the following steps: firstly partitioning a doubly coated fiber which is required for manufacturing a power stripper into multiple region segments along the length direction; then partially stripping low-refraction coatings, namely external coatings, on the doubly coated fiber in the corresponding region segments so as to obtain required light power leakage window naked bodies, wherein relative rotation angles which take a fiber core as an axis exist among the adjacent required light power leakage window naked bodies; finally coating and curing the manufactured light power leakage window naked bodies by use of ultraviolet glue with high refractive index, thereby finishing the manufacturing of the fiber cladding power stripper. According to the method, the coatings on the fiber are partially stripped, multiple light power leakage windows are manufactured in a multi-region multi-angle mode, leaked light power is distributed in multiple regions of the fiber, so that the temperature of an initial leakage point of leaked light is greatly reduced, and the safe operation of devices is ensured.

The invention discloses a method and reagents for constructing a nucleic acid single-strand circular library. The method comprises the following steps: using a transposase embedding complex to randomly interrupt the nucleic acid to form a first joint at both ends and a gap. Fragment; connect the second linker at the gap; perform the first PCR reaction to obtain the product of connecting the first linker and the second linker sequence at both ends; enzyme digestion to generate a nick, and then perform double-stranded circularization to generate a circular nucleic acid molecule; from Carry out restriction nick translation reaction at the nick; digest the part that has not occurred restriction nick translation reaction; connect the third adapter and oligonucleotide adapter sequence; perform the second PCR reaction to obtain the third adapter and oligonucleotide at both ends respectively The product of the acid linker sequence; isolate the single-stranded nucleic acid; circularize the single-stranded nucleic acid to obtain a single-stranded circular library. The method of the present invention realizes simple and rapid construction of a nucleic acid single-stranded circular library through the combination of transposase breaking and restriction gap translation reaction.

The invention discloses a seawater intrusion simulation test sandbox, which belongs to the technical field of test simulation devices. A medium chamber for containing water-containing media such as sandstone and soil is arranged in the middle of the test sandbox. The left and right ends of the test sandbox are respectively equipped with The seawater chamber for dyed seawater and the freshwater chamber filled with deionized water; the main body of the test sand box is made of acrylic board; the two sections in the middle of the medium chamber are provided with rubber layers that can be seamlessly overlapped with each other and can be inserted into the box; Both the seawater chamber and the freshwater chamber are divided into ABC three chambers; the seawater chamber C is separated from the medium chamber in the middle of the test sand box by a porous plate and nylon mesh; the upper and lower ends of the seawater chamber and the freshwater chamber are equipped with water tanks and recovery boxes. The seawater intrusion simulation test sand box provided by the present invention can realize the control of the water level conveniently and flexibly; it can also change the simulation length conveniently and flexibly, not only can measure the concentration and pressure at a given point, but also can control the water level more freely. Determine the point to measure.

The invention belongs to the technical field of medical nerve cultivation, and in particular relates to a three-dimensional stretching and cultivation system for nerve axons, which includes a stretching and cultivation device and a control system connected with the stretching and cultivation device. The stretching and cultivation device includes a horizontally arranged A cultivation platform, a fixed base and a movable base arranged on the cultivation platform, a cell culture tank is arranged on the movable base, and the cell culture tank is connected with a pulling mechanism and a rotating mechanism; the control system includes a control system connected with the pulling mechanism and the rotating mechanism. device, and host computer, the host computer is connected with the controller; the invention can flexibly control the length, direction and speed of axon growth; it can be compared with the axon cells cultured in a two-dimensional environment, so as to cultivate axon cells for patients Higher quality nerve tissue with appropriate length and regular growth can be used for repairing nerve loss and has broad application prospects.

The invention provides a production technology for a hollow abnormal-shape electric anaerobic copper plate, comprising the following technologies of: upwards leading a continuous anaerobic copper strip blank, carrying out cold rolling, annealing, brushing in an acid washing way, carrying out primary cold-rolling forming (a cold rolling method), straightening, testing, and packing. Compared with the prior art, the production technology has the following advantages that 1) the production technology is high in production efficiency, and the cold rolling technology primarily and coldly rolls double rows of continuous electric convex hulls through a specific abnormal-shape hole pattern, so that the primary forming can be carried out; 2) the product is regular in appearance shape, the electric convex hulls which are primarily formed by the cold rolling method and the cross-section shapes are regular in shapes, and are stable and even in size, and the defect problem such as the 'bamboo joints' shape caused by the repeated press forming in the conventional technology can be avoided; 3) the production technology is short in technological process, is low in cost, and is directly and coldly rolled into stripe materials as required by upwards leading the continuously-cast anaerobic copper strip blank, the primary cold-rolling forming can be carried out after the thermal treatment, the higher-cost procedures such as the heating and the hot-rolling cogging can be eliminated, the technology can be optimized, and the production cost can be reduced; and 4) the product is good in product quality, and has the characteristics of being high in purity, low in oxygen content, high in electric conductivity, and good in surface quality.

A mass tuning type vibration reduction multi-pendulum structure with air springs and damping particles mainly comprises a rigid hanging rod, tuning mass balls, the air springs, anchoring bolts, a top hinged seat, reserved filling holes and the damping particles. The device is connected with a structural floor. By using the characteristic that the period, mass, pendulum length and rigidity of the multi-pendulum structure are all related, the mass of the tuning mass balls, the length of each section of the hanging rod, rigidity of the air springs and the overall damping of the damping particles are reasonably set, so that the multiple natural vibration periods of the mass tuning type vibration reduction multi-pendulum structure is equal to or close to the corresponding multi-order period of the structure, and accordingly tuning vibration reduction control over the structural multi-vibration mode is achieved and dynamic response of a structural body under earthquakes and wind loads is reduced.

The invention discloses a honeycomb array spoiler type sound field damping net and a noise control method in offshore piling. The honeycomb array spoiler type sound field damping net comprises a buoyant box, a sound field damping box and a sinking box which coaxially sleeve the outside of a pile body sequentially from top to bottom. The sound field damping box comprises a plurality of cylindricalhoneycomb structure turbulent flow boxes which are coaxially arranged sequentially from top to bottom. Each honeycomb structure turbulent flow box is formed by densely laying a plurality of spoiler fins. Each spoiler fin comprises a hexagonal connecting frame, an inclined supporting frame and a turbulent flow piece. Each turbulent flow piece is in an arc shape and can rotate. The middle of each turbulent flow piece is connected with the corresponding inclined supporting frame through a tensioning and compressing spring rod. In the honeycomb array spoiler type sound field damping net, the relative position of the sound field damping box and the pile body can be fixed through the buoyant box, meanwhile the stability of the whole damping net in water is ensured, the working space is providedfor above-water construction, and the noise of piling can be passively and effectively weakened with zero energy consumption through the compound honeycomb structure turbulent flow boxes; and by meansof the sinking box, it can be ensured that the honeycomb structure turbulent flow boxes sufficiently divide a central pile base high-noise water body and an external environment water body and no noise is emitted out.

The invention proposes a multifunctional poking mechanical arm device of a loading machine. The device comprises a mounting plate, a poking arm module, an oil cylinder module, a steering module and a balance module; one end of a first poking arm of the poking arm module is hinged with one end of a second poking arm; the other end of the second poking arm is hinged with the mounting plate; the other end of the first poking arm is hinged with the steering module; a chute is formed in a steering base; a steering slide block is mounted in the chute; the first poking arm is hinged with the steering slide block; a first oil cylinder of the oil cylinder module is hinged with the steering slide block and the first poking arm; a second oil cylinder is hinged with the first poking arm and the second poking arm; a third oil cylinder is hinged with the second poking arm and the mounting plate; a rotating oil cylinder is respectively hinged with the steering slide block and the steering base; and one side of a hinge rod of the balance module is hinged with the steering base, and the other side is hinged with a frame. The mounting plate is fixed on the poking arm module, and extends to the front side of a shovel bucket of the loading machine, so that the loading machine is convenient to poke materials, difficult to shovel at ordinary times, into the shovel bucket.

The invention relates to the technical field of dental instruments, in particular to a drill bit for dental implantation. The specific technical solution is: a drill bit for dental implantation, including a drill bit and a drill rod fixed by a base plate, a bearing is set on the drill rod, an abutment is fixed on the outer ring of the bearing, and a water storage chamber is arranged at the axis of the drill bit. The water storage cavity is provided with a water outlet channel communicating with the water storage cavity, and a chip suction cavity is provided around the water storage cavity in the drill bit, and several chip suction holes communicated with the chip suction cavity are arranged on the side wall of the drill bit; There are several annular chip suction holes communicated with the chip suction chamber and several water inlet channels communicated with the water storage chamber, and the abutment is provided with an annular chip suction groove communicated with the annular chip suction holes and an annular water inlet channel communicated with the water inlet channel , the annular chip suction groove and the annular water inlet groove are respectively provided with an air port and a water inlet, and the air port and the water inlet are respectively connected with an air pump and a water pump through pipelines. The drill bit provided by the invention can simultaneously cool the drill bit and remove chips during the working process.