48results about How to "Defense against intrusion" patented technology

The invention relates to a respiratory system protecting appliance, in particular to a mask capable of preventing and curing haze and influenza. The mask comprises a mask body and ear hangers, wherein the mask body covers the face, the mouth and the nose of a user; the ear hangers are connected to two short edges of the mask body and are hung on ears of the user; the mask body comprises two layers of cloth, two layers of filtering plates and a plastic nose strip; the two layers of filtering plates are arranged between the two layers of cloth; the plastic nose strip is concealed in the outer layer of cloth; the first layer of cloth is in contact with an external environment direction; the second layer of cloth is adhered to the face, the mouth and the nose of the user and is in contact with the user direction; and the filter plates comprise a filter plate which has a four-layered structure and a filter plate which has a three-layered structure and is filled with Chinese herb extracts. The mask can effectively resist PM (particulate matter) 2.5, and can also prevent influenza; a mask body can be cleaned; the filtering plates of the mask can be changed; the filtering efficiency, the breathability and the antibacterial property of the filtering plates of the mask can be obviously improved; the mask is simple in structure and comfortable to wear; and health of human bodies is facilitated.

The invention relates to a fence system which comprises a plurality of steel fence units, wherein each fence unit comprises a pair of fence columns and a meshed sheet installed between a pair of fence columns. The fence system is characterized in that the meshed sheet is formed by mutual zigzag welding of a plurality of transverse tendons and longitudinal tendons; in the meshed sheet, the distance between two adjacent transverse tendons is 74.5-75.5 mm, and the distance between two adjacent longitudinal tendons is less than 15 mm; or the distance between two adjacent transverse tendons is less than 15 mm, and the distance between two adjacent longitudinal tendons is 74.5-75.5 mm; and a part of the meshed sheet is bent outwards to form a raised part tensioning the meshed sheet. The invention enhances the intensity and the beautiful appearance of the meshed sheet by adding the bent raised parts, and simultaneously, the high-density anti-shearing design also greatly reduces the possibility of man-made damage, thereby effectively preventing the invasion of foreign personnel.

The invention discloses a high-purity and high-activity medical collagen of aquatic biological source, which solves the problems of poor mechanical strength, weak anti-degradation ability and easy microbial infection of natural collagen dressings. Collagen is extracted by acid extraction combined with pepsin to remove telopeptides, and the extraction rate is improved by ultra-high pressure treatment and tissue crushing, and through decellularization, impurity removal, degreasing, multiple salting out, dialysis, and sterilization , decolorization and depyrogenation and other series of purification operations to prepare high-purity and high-activity medical collagen. The network-like collagen sponge with uniform pores was prepared by vacuum freeze-drying process, and then the collagen sponge was modified by physical cross-linking and chemical cross-linking to prepare the inner layer, and then combined with chitosan outer film and medical non-woven The cloth-based cloth layer is compounded, and finally the finished composite multi-layer medical dressing is obtained after Co-60 sterilization.

The invention discloses a plant growing promoter and the preparing method. It comprises chitlsan oligosaccharide, compound amino acid, micro nutritious element, complexing agent, surface active agent, etc. It can promote plant growth, activate plant cell, strengthen abilities of plant antivirus and pathogenic germs, strengthen plant anti-contradictoriness, promote plant to absorb nutrient, and improve the quality and output of the crop, besides without pollution.

The invention relates to a medical nanometer antibacterial composite dressing and a method for preparing the same, wherein the dressing consists of a bacteriostatic functional layer, a water absorbing layer, an adhesive layer and a release paper layer, wherein the bacteriostatic functional layer is prepared by compounding a macromolecular omentum with a nanometer antibacterial material by a self-assembly method, the bacteriostatic functional layer and the water absorbing layer are adhered together through a hot-melt adhesive and are fixed on a non-setting adhesive in the middle of the adhesive layer, the periphery of the release paper layer is adhered and fixed with a rubber layer exposed on the periphery of the adhesive layer, and the middle part thereof is covered on the bacteriostatic functional layer. By making use of a surface grafting method, a nanometer antibacterial agent grows on the surface of the macromolecular omentum to form the firmest chemical bond connection through chemical actions at high temperature and high pressure. The medical nanometer antibacterial composite dressing can effectively absorb redundant water content at a wound and resist the invasion of external bacteria, nanometer particles cannot be aggregated into larger particles easily, and the bacteriostatic effect is good. The medical nanometer antibacterial composite dressing has the advantages of broad spectrum, long-term effect, safety, ultra-strong bactericidal function, and pollution-free and convenient use.

The invention discloses perpendicularly integrated two-degree-of-freedom omnibearing rotating shafts and bearings. A perpendicular connecting body longitudinal surface and a perpendicular connecting body transverse surface are intersected, wherein a perpendicularly integrated longitudinal bearing body and a perpendicularly integrated transverse bearing body are positioned on the two sides of the perpendicular connecting body longitudinal surface and the perpendicular connecting body transverse surface; perpendicularly integrated longitudinal bearings are positioned at the two ends of the perpendicularly integrated longitudinal bearing body; perpendicularly integrated transverse bearings are positioned at the two ends of the perpendicularly integrated transverse bearing body; fastening shafts and support seat nuts are arranged on longitudinal shaft bodies and transverse shaft bodies; longitudinal tapered shafts are positioned at the lower ends of the longitudinal shaft bodies; transverse tapered shafts are positioned at the lower ends of the transverse shaft bodies; the longitudinal shaft bodies are connected with longitudinal shaft support seats; the transverse shaft bodies are connected with the transverse shaft support seats; the longitudinal tapered shafts are inserted into the perpendicularly integrated longitudinal bearings; the transverse tapered shafts are inserted into the perpendicularly integrated transverse bearings. The perpendicularly integrated two-degree-of-freedom omnibearing rotating shafts and the bearings are simple and compact in structure and flexible in rotation, and the production and maintenance cost of the two-degree-of-freedom omnibearing rotating shafts and bearings can be effectively lowered.

The invention relates to the technical field of a well cementing liquid for an oil gas well, and relates to a multi-temperature-section MTC (mud to cement) well cementing liquid and a preparation method thereof. The multi-temperature-section MTC (mud to cement) well cementing liquid is prepared from the following raw materials in parts by weight: 100 parts of mineral waste residue powder, 50 parts of well drilling liquid, 1-12 parts of activating agent, 0.5-7 parts of activating auxiliary agent, 0.05-0.5 part of dispersion agent and 75-85 parts of water. According to the invention, through the dual functions of the activating agent and the activating auxiliary agent, the mineral waste residue powder can be fully and completely hydrated in a short time, thus special requirements to mineral waste residue powder are prevented, the preparation technology is simplified, the multi-temperature-section MTC well cementing liquid has the characteristics of good hydration stability, high intensity and resistance to invasion of corrosive ground layer fluids, the capability of ground layer water corrosion resistance of a solidified body is improved, the long-term seal property in the rear stage of production process is improved, and the multi-temperature-section MTC well cementing liquid is suitable for well completion construction operation within the middle and low temperature ranges, and has better effects in well completion construction operation with high possibility of well leakage and gas channeling in a low-temperature shallow layer.