31results about How to "Free passage" patented technology

The invention provides a preparation method and application of an electrochemical sensor based on tyrosinase nanocapsules. First, the surface modification of tyrosinase: adding alkenyl-containing groups, through adsorption, covalent crosslinking, etc. Immobilization of alkenyl-bearing small molecules to the surface of enzyme molecules, making them polymerizable enzyme single molecules; followed by in situ free radical polymerization: adding stabilizers, monomers, crosslinkers and initiators to the surface-modified In the tyrosinase solution, through in-situ free radical polymerization, the polymer forms a thin layer of network polymer on the surface of the enzyme molecule to form an enzyme single-molecule nanocapsule; freeze-drying to obtain the tyrosinase nanocapsule; Finally, an electrochemical sensor based on tyrosinase nanocapsules was prepared. The sensor not only has high sensitivity, low detection limit and high selectivity, but also has high stability, reliability, portability, low cost and simple preparation method.

The invention relates to a flow limiting shutoff valve which comprises a flow stop valve and a block valve. The flow stop valve comprises a valve body, a piston and a bias component. A through cavity is formed on the valve body, a water outlet of the through cavity is provided with a sealing seat, the piston can be arranged in the through cavity axially movably back and forth, and a middle cavity is formed by matching among a corresponding outer wall of the piston, an inner wall of the through cavity and the sealing seat. A flow-guiding through hole with a preset through-flow area is formed on the piston, and the middle cavity is communicated with a water inlet through the flow-guiding through hole. One end of the piston towards the sealing seat is provided with a sealing element. When flow of the water inlet is smaller than a preset value, the sealing element is separated from the sealing seat; when the flow of the water inlet is larger than the preset value, the sealing element positioned on the piston is in contact seal with the sealing seat; and when the block valve is closed, automatic reset of the piston can be achieved.

A device, incorporated into a web winding machine (1), such that the web is separated at a given position during winding onto the winding shaft such that the free end resulting from the separation points in the direction of the portion of the web in the direction of transport of the web Conveying on winding shafts arranged against the conveying direction. Also disclosed is a web winding machine with the above-mentioned device and a drive that brings the above-mentioned device from a waiting position to an operating position and then winds the web with a contact roller (8) on a first winding shaft. There is also a pressure element, which makes the first winding shaft press against the contact roller, so that the fiber web to be wound is wound on the first winding shaft due to friction, and the fiber web is separated by this device and part of the fiber web is moved to the second winding shaft. Winding shaft delivery. Also relates to a method of operating a web winder: winding an incoming web around a first winding shaft; separating the web if a separation state (S2) is detected, and upon completion of the separation of the web or immediately thereafter Finally, a part of the web is conveyed in the direction of the second winding axis.

The invention discloses a space-adjustable aquatic plant co-culture device. The space-adjustable aquatic plant co-culture device comprises a first stainless steel grid mesh, a stainless steel grid mesh, a third stainless steel grid mesh, a co-culture glass tank and glass strips and is characterized in that the glass strips are fixed to the first long side face and the second long side face of the rectangular co-culture glass tank through glass cement; the first stainless steel grid mesh, the second stainless steel grid mesh and the third stainless steel grid mesh are inserted in a groove formed by the glass strips freely or at equal intervals. The space-adjustable aquatic plant co-culture device is simple in structure, convenient to maintain and low in cost, experiment errors are substantially reduced, experiment efficiency is improved, the experiment accuracy rate is increased and experiment precision is improved. The stainless steel grid meshes have the advantages that the grid meshes are resistant to acid and alkali corrosion and high-temperature oxidization and trace level chemical substances released by plants in a co-culture system are not adsorbed, and the stainless steel grid meshes can be used for a chemical competition experiment and high-temperature sterilization before the experiment. The grid meshes can be reused after the experiment ends.

The present invention discloses a backing assembly-type roof framed bent. The framed bent comprises a plurality of roof framed bent pillars, a plurality of purlines, a plurality of purline connection plates, and a plurality of purline fastening members, wherein the roof framed bent pillars are connected and fixed with a reinforced concrete building roof surface through the fastening members, the purline connection plates at two ends of the purlines are arranged on upper end pillar inclined face connection plates of two adjacent roof framed bent pillars, and the purline connection plates and the upper end pillar inclined face connection plates are connected and fixed through the purline fastening members. The backing assembly-type roof framed bent is advantageous in that the transportation and the assembly are convenient and rapid, members of a roof can be replaced at will without lifting up any tiles, the maintenance is convenient, the structure is simple, materials are saved, the construction cost is low, people between roof frames can freely pass the space on the roofs, and the space can thus be fully utilized.

The invention discloses a high-efficiency brood hatching device and an experimental method for Procambarus clarkii. A water inlet is provided at a higher position on one side of the box body, and a water outlet is arranged at the bottom of the other side side of the box body. The microporous aeration equipment includes an oxygen inlet. Pipe and microporous oxygen-increasing bubble strips, the outside of the box is equipped with oxygen inlet tubes, the bottom of the box is equipped with micro-porous oxygen-increasing bubble strips, the bottom of the box is equipped with PVC square tubes, and the inner walls of the PVC square tubes are equipped with the first storage rack, the second rack is provided under the first rack on both sides of the PVC square pipe, and plant fibers are arranged on the first rack and the second rack; the present invention can increase the number of egg-bearing shrimp per unit area through the multi-layer egg-bearing hatching device. Capacity, and can use the limited space to expand the activity area of ​​juvenile shrimp. This device is convenient to transport and easy to operate. It can improve the breeding habitat of egg-bearing shrimp and seedlings, and improve the egg hatching rate, hatching capacity per unit area, and seedling quality.

The invention relates to the field of bee breeding, in particular to a beehive with a prison king device, comprising a box body with an opening, feet are provided around the lower box wall, and a secondary cover, a relay box and Nest box, the successor box is coupled with a vertically placed flat-bottomed conical partition, and the gap in the nest box is matched with a vertically placed rectangular nest plate; there is an opening in the center of the box cover, and a prisoner device passes through the opening , the prison king device includes a main rod, the lower end of the main rod is slidably connected with a cylindrical sleeve, the sleeve is slidably connected with the main rod, a horizontal horizontal plate is placed under the sleeve, and the distance between the sleeve and the horizontal horizontal plate is There are at least 5 cage grids that form a circular matrix around the cylindrical sleeve and are welded between them, and the distance between any two adjacent cage grids is equal. The purpose of this invention is to use the slider link mechanism formed between the cage grid, the sleeve and the horizontal horizontal plate to gradually expand the range of activities of the queen bee in the queen prisoner, so as to solve the problem of the queen bee being emotionally excited and irritating the worker bees surrounding the queen. .

The invention provides crystalline-type waterproof paint for preventing cement leakage, which belongs to the field of waterproofing work in constructional engineering, solves the technical problem of cement leakage prevention in the prior art, and is prepared from the following raw materials in weight ratio: 52.5 ordinary Portland cement, No. 95 granulated blast furnace mineral powder, penetrating agent, expanding agent, silica fume, quartz sand, modified bentonite, modified sodium silicate, complexing agent and crystallized precipitant. The cement-base waterproof paint provided by the invention enables concrete to be waterproof, is inorganic material, has the service life as long as concrete, improves concrete density to improve the concrete strength, and has the characteristics of low possibility of leakage, carbonization resistance, resistance to harmful substance permeation, simplicity in construction operation, low construction cost and the like.