42results about How to "Simple structure control" patented technology

The invention discloses a reducible and biodegradable comb type high polymer gene vector and a preparation method of the same. The structure of the vector is as shown in the following formula, wherein CP is a cationic polymer with low molecular weight between 600 and 30000; F1 and F2 are groups capable of interaction; F1 or F2 contains a disulfide bond; M is a main chain unit structure of the polymer; n equals to 10-500; m is smaller than n; m equals to 0-400; l equals to 0-800; and l, m and n are integers. In the invention, the comb type high polymer gene vector has small cytotoxicity, gene DNA can be well bound and compounded under physical conditions so as to enter cells; and the carried genes can be released as the reducing environment in the cells can rupture quickly. The result show that the reducible and biodegradable comb type high polymer gene vector has higher transfection efficiency and lower cytotoxicity compared with 25kDa PEI (polyether imide); moreover, the preparation method is simple, and the structure is easy to control.

The invention discloses a high-pressure waterway control system, which comprises a high-pressure water pump and an operation element control valve, wherein the high-pressure water pump is connected with the operation element control valve through a pipeline; the pipeline is provided with a discharging valve; the water outlet of the discharging valve is communicated with a water tank; the discharging valve is connected in parallel with an easy-start valve; and the water outlet of the easy-start valve is communicated with the water tank. Due to the adoption of the high-pressure waterway control system, the functions of no-loading start, automatic charging and safe overflow safely are compounded; and the high-pressure waterway control system has the advantages of simple and compact structure, convenience for installing and adjusting, reduction in the cost, improvements on the system reliability and the maintainability, and the like.

The invention relates to a method for preparing carbon airgel from a hydrogel precursor material through a hydrothermal process, belongs to the field of new materials, and solves the problems of complicated carbon preparation process and high cost of supercritical drying in the prior art. The invention comprises the following steps: step 1, acidifying chitosan with dilute hydrochloric acid, and forming a mixed solution with water-soluble carbohydrates; step 2, adding polysorbate nonionic surfactant and liquid paraffin, and then adding pentamethylene glycol Aldehydes to form hydrogels; step 3, placing the hydrogels in a reactor for hydrothermal reaction to obtain primary carbonized products; step 4, cleaning the primary carbonized products and replacing them with two-stage solvents; step 5, dissolving the primary carbonized products After further heat treatment, the microstructure was characterized by scanning electron microscopy, and the pore properties of the sample were determined by nitrogen adsorption. The invention utilizes low-cost raw materials to generate the carbon airgel structure in one step; utilizes two-stage solvent replacement to realize normal-pressure drying of the carbon airgel structure.

The invention discloses a reduction sensitive polyethyleneimine derivative containing modified disulfide bonds, having a chemical formula: PEI-(ASSA-PEI)n-(ASSB-PEI)m, wherein PEI is polyethyleneimine, the component of A is C10H14O4N4, the component of B is C3H5ON, n=0-30; m=0-30; and n and m are not equal to zero simultaneously. The weight-average molecular weight of the reduction sensitive polyethyleneimine derivative is 5,000-80,000. Through simple and special modification and click chemistry, the polyethyleneimine is connected into modified polyethyleneimine with high molecular weight through reductive and degradable disulfide bonds. The invention has the advantages of simple method, easy structure control, less amino loss for reaction and higher amino utilization ratio. The obtained product has the characteristics of bio-reduction and degradation, has less cytotoxicity, can well bind and compound gene DNA under a physiology condition, enters cells to release carried gene because the reduction environment in the cells can be broken more rapidly, and has higher gene expression transfection efficiency. Results show that the modified polyethyleneimine derivative has higher transfection efficiency and lower cytotoxicity than 25kDa PEI.

The invention discloses a wireless bidirectional charging and discharging system for an electric vehicle, which includes a first circuit and a second circuit; the first circuit includes a bidirectional AC-DC circuit, a first bridge circuit, a first coupling mechanism and a first control circuit, and the first circuit includes a bidirectional AC-DC circuit, a first bridge circuit, a first coupling mechanism and a first control circuit. The second circuit includes a second coupling mechanism, an active compensation circuit, a second bridge circuit, a bidirectional DC-DC circuit and a second control circuit. The first circuit and the second circuit establish a wireless connection and transmit vehicle information and instructions before charging and discharging, and then transmit charging information and shutdown instructions through the wireless connection after charging and discharging, avoiding real-time wireless connection during energy transmission. Transmit control information; no matter the system is working in charging or discharging mode, after the transmitter is started, only the receiver needs to perform closed-loop regulation according to the instructions to realize the two-way transmission of grid energy and battery energy. The invention does not adopt a receiving end regulation mode, and has the advantages of simple control, strong anti-offset regulation ability, wide voltage adaptability range, high transmission efficiency and the like.

The invention relates to the technical field of supplementary light for photographing, and specifically discloses a supplementary light for photographing with handheld devices such as mobile phones and PDAs, which at least includes an annular aperture, the annular aperture is a non-closed ring, and the annular aperture has an arc shape. The notch, the arc-shaped notch corresponds to a central angle of 50° to 75°. The supplementary light of the present invention is especially used for selfie supplementary light, forming light shadows on the cheeks, chin and neck of the face, using light and dark contrast to make the light layering of the face richer, the photo effect is more three-dimensional, and the color of the skin is more vivid. Natural, and creates a face-lifting effect through the layering of light.

The invention discloses a tracking filling part for a filling machine. The tracking filling part comprises a rack, a filling needle frame assembly, two first swinging arms and two second swinging arms, wherein the two first swinging arms are hinged to the rack; the two second swinging arms are hinged to the filling needle frame assembly; the first swinging arm and the second swinging arm which are on the same side are hinged with each other; a connecting rod is hinged between the two first swinging arms or between the two second swinging arms; at least one of the first swinging arms is connected with a first driving mechanism which is used for driving the at least one first swinging arm to swing around the rack; at least one of the second swinging arms is connected with a second driving mechanism which is used for driving the at least one second swinging arm to swing around the corresponding first swinging arm; the rack, the connecting rod and the two first swinging arms form a parallelogram mechanism, and the filling needle frame assembly and the two second swinging arms form another parallelogram mechanism; or, the filling needle frame assembly, the connecting rod and the two second swinging arms form a parallelogram mechanism, and the rack and the two first swinging arms form another parallelogram mechanism. The tracking filling part for the filling machine has the advantages of being simple in structure control, low in cost, low in pollution risk and the like.

An automatic pearl drilling device is provided with a rack and a discharging mechanism. The rack is provided with a hopper, a clamping mechanism, a drilling mechanism and a feeding mechanism. The feeding mechanism comprises a guide pipe, a guide piece and a feeding piece connected with the guide pipe and the feeding station, wherein the guide piece enables a single pearl to move from the feeding station to the drilling station and the discharging station in sequence. The feeding piece only allows one pearl to enter the feeding station every time. The drilling station aligns at the drilling mechanism, the discharging station is communicated with the discharging mechanism, and the guide pipe is inclined downwards. The clamping mechanism aligns at the drilling station and compresses pearls towards a guide plate. The drilling mechanism comprises a drill bit, a drilling motor for driving the drill bit to rotate, a feeding motor and a feeding drive mechanism, and the feeding motor and the feeding drive mechanism are used for enabling the drill bit to be fed towards pearls and enabling the drill bit and the drilling motor to move back and forth continuously. The automatic pearl drilling device has the advantages that pearls are positioned stably in the drilling process, and requirements for equipment manufacturing and installation accuracy are low.