124results about How to "High shielding efficiency" patented technology

The invention relates to an electromagnetic shielding optical window with a two-double pane metal grating structure and belongs to the optical transparent piece electromagnetic shielding technical field; the electromagnetic shielding optical window is formed by placing two layers of pane metal gratings or metal silk screens with the same structure parameters on two sides of the optical window or a transparent underlay in parallel; a side length of a pane of the two-double pane metal grating is greater than two times of a side length of a pane of the prior monolayer pane metal grating; the space between two layers of pane metal gratings is two to four times of the side length of the pane; compared with the prior monolayer pane metal grating, the optical window adopting the two-double pane metal grating structure does not reduce light transmittance, substantially improves the shielding efficiency of microwaves and millimeter waves, solves the problems that the high light transmittance and strong electromagnetic shielding efficiency can not simultaneously considered in the prior optical window electromagnetic shielding technology and is suitable for electromagnetic shielding in aerospace equipment, security facilities, medical diagnostic instruments and other military and civil optical transparent pieces.

An electric apparatus module 1 includes an upper casing 6, a lower casing 7 to which the upper casing 6 is attached and which is attached to a rear panel 2, an electronic device unit 8 accommodated in the upper casing 6 and the lower casing 7, a conductive shield shell 9 covering the electronic device unit 8, and a conductive ground shell 10 which is attached to the lower casing 7 at a side of the rear panel 2. The ground shell 10 includes a flat plate portion 83 piled on the rear panel 2, a contact piece 84 erected from an outer edge 83c of the flat plate portion 83 toward the lower case 7, and a contact member 85 protruded from a rear surface 83b of the flat plate portion 83 at the side of the rear panel 2. The contact piece 84 is inserted through a through hole 56 formed on the lower casing 7 to contact with the shield shell 9. The contact member 85 is inserted through a through hole 11 formed on the rear panel 2 to contact a cylindrical shield member 22 of an external device.

The invention discloses a making method of ultraviolet masking agent of sericite mica, which comprises the following steps: 1) preparing fined sericite mica; 2) activating the sericite mica powder; 3) adding water in the sericite mica to form the suspension with density at 2. 5-5%; adjusting the pH value to 2. 0-2. 5 through alcaine as system C; 4) allocating titanic chloride solution with density at 10-15%; adding zinc chloride in the titanic chloride solution; making the molar rate of Zn and Ti at 1: 2; obtaining the solution D; 5) dripping the solution D into the system D; controlling the pH value to 7. 0; 6) filtering the sediment; washing; drying at 95 deg. c; 7) grinding the drier; placing the drier in the electric furnace at 600 deg. c for 2-3h; 8) grinding the sintered material; beating to 10-15um; obtaining the product.

The present invention relates to a polymer-based, wideband electromagnetic wave shielding film. More particularly, the present invention relates to a polymer-based, wideband electromagnetic wave shielding film capable of improving electromagnetic wave shielding and absorption performance, by applying a multilayer graphene-nanotube-metal oxide nanostructure in which a conductive material and a magnetic material are complexly combined, as a filler of the polymer.

An electromagnetic interference (EMI) shielding structure, which includes: a substrate, at least one chip unit, a packing layer, and an EMI shielding unit. The chip unit is disposed on the surface of the substrate and electrically coupled thereto. The packing layer is formed on the substrate and covers the chip unit. The EMI shielding unit includes: a first, second, and third shielding layer. The first shielding layer covers the outer surface of the packing layer and the lateral surface of the substrate. The second and third shielding layer respectively covers the outer surface of the first and second shielding layer. Based on the instant disclosure, the EMI shielding unit uses the methods of sputtering and electroless plating, to increase the adhesion strength of the EMI shielding unit and make the thickness of the shielding layer uniform. The instant disclosure raises the EMI shielding efficiency and lowers the manufacturing cost.

The invention discloses an X-ray and gamma-ray shielding non-woven fabric and a preparation method thereof. The X-ray and gamma-ray shielding non-woven fabric is formed by uniformly doping tantalum, tungsten and strontium or a compound thereof in a polypropylene non-woven fabric. The metals or compounds in the non-woven fabric account for 60wt%-70wt% of the non-woven fabric; and tantalum accounts for 30%-40% of the metals, tungsten accounts for 40%-50% of the metals and strontium accounts for 10%-30% of the metals. The preparation method of the X-ray and gamma-ray shielding non-woven fabric adopts a melt blowing and spraying composite technology; and the X-ray and gamma-ray shielding non-woven fabric provided by the invention has the characteristics of no skin contact toxicity, no shielding weak-absorption zone and high shielding efficiency.

The present invention relates to a method for controlling weld quality. The method comprises the steps of producing a shield gas curtain around the heat source and producing a shroud gas curtain spaced radially outward from the shield gas curtain, wherein the shroud gas curtain comprises a radially outward component of velocity. The shield gas curtain and the shroud gas curtain are configured to control the resultant mechanical and/or surface properties of the weld. The present invention also relates to a method for substantially confining and concentrating shield gas about the vicinity of a welding site, and a method for substantially recovering and reusing a shield gas in a welding operation.

The invention belongs to the field of a radiation protective material and especially relates to a neutron radiation protective clothing material and its preparation method. The technical scheme is as follows: the neutron radiation protective clothing material is characterized by at least comprising five layers of padding non-woven fabrics with different functions; the outermost layer (1) is padding non-woven fabric containing heavy metal; a second layer (2) is padding-free non-woven fabric; a third layer (3) is low-boron padding non-woven fabric; a fourth layer (4) is high-boron padding non-woven fabric; the innermost layer (5) is lead-containing padding non-woven fabric; and the five layers of functional padding non-woven fabrics are prepared by overlaying and sewing from the outermost layer (1) to the innermost layer (5) when in use. A preparation method of each functional layer comprises steps: (a) melt-blowing; (b) spraying; and (c) compounding. The neutron radiation protective clothing material has intermediate energy neutron, thermal neutron and X, gamma ray shielding functions, and has advantages of soft fabric, wear comfortableness and high shielding efficiency, simple production technology. Meanwhile, the preparation method has advantages of simple production technology, high production efficiency and low processing cost.

The invention belongs to the field of irradiation protective material and in particular relates to a neutron irradiation protective clothing material and a preparation method for the same. The technical scheme is that the neutron irradiation protective clothing material is characterized by at least comprising five layers of filler non-woven fabric with various functions; the outmost layer (1) is a non-woven fabric containing heavy metal; the second layer (2) is a non-woven fabric without fillers; the third layer (3) is a filler non-woven fabric with boron; the fourth layer (4) is a filler non-woven fabric with high boron content; and the innermost layer (5) is a filler non-woven fabric with lead. During the use, the five layers are orderly overlapped and sewed together. Each functional layer is prepared according to the following steps of (a) melt-blowing, (b) spraying and (c) composing. The neutron irradiation protective clothing material has shielding functions for intermediate energy neutrons, thermal neutrons, X and Gamma rays; the fabric is soft, comfortable to wear and has high shielding efficiency; and the production technology is simple, production efficiency is high and production cost is low.

Provided is a manufacturing apparatus for a carbon nanotube including: at least two electrodes whose tips are opposed to each other; at least a power supply that applies a voltage between the two electrodes to generate discharge plasma in a discharge area between the two electrodes; and at least a plurality of magnets that generates, in a generation area of the discharge plasma, at least one of a magnetic field of multiple directions and a magnetic field having a component in parallel with a flowing direction of a discharge current, in which a thermal shield wall made of a non-magnetic material is disposed between the magnets and the generation area of the discharge plasma. Accordingly, an influence on the magnetic field due to the heat generated from the discharge plasma can be suppressed, and a high-purity carbon nanotube with excellent industrial efficiency can be stably manufactured.

Disclosed is a radioactive contaminant container including a wall that defines a containing space for containing radioactive contaminants and shields at least a portion of radiation irradiated from the radioactive contaminants, and the wall has an outer shape of a hexagonal cylinder or a substantially hexagonal cylinder.

The invention discloses an image region shielding method, a device, equipment and a storage medium, and belongs to the technical field of image processing. The method comprises the steps of obtaininga region image of a to-be-shielded target in a current video frame, wherein the current video frame is any one video frame in a video; determining a semantic segmentation image of the area image; determining a pixel point belonging to the target from the current video frame based on the semantic segmentation image; and shielding an area corresponding to the determined pixel point. According to themethod and the device, manual operation of a user is avoided, the shielding efficiency is improved, and the pixel points belonging to the target are accurately determined based on the semantic segmentation image, so that the target can be accurately shielded, and the shielding accuracy is improved.

The invention discloses a method for controlling Internet encrypted safe communication in the technical field of information, which completely controls the transmission of encrypted information through a proxy server with high efficiency by extracting the addresses of the proxy server used in the communication of encrypted communication software and by the automatic setting and shielding of the accesses to the proxy address by a gateway. Compared with the prior art, the method effectively solves the problem of low shielding efficiency caused by quick dynamic website update and increase by updating dynamic shielding proxy website data in real time and can improve information filtration efficiency, thereby radically preventing the transmission of encrypted information and improving information control effect. The method can shield 100 percent of specific websites required to be shield according to the conventional filtration control rules and more than 99 percent of information accessed by the encrypted communication software.

The invention provides a heating device applied to a scanning electron microscope. The device comprises a sample crucible, a heating core ceramic, an electric heating wire and a heat radiation shielding structure, wherein the sample crucible is placed on an upper end of the heating core ceramic, the electric heating wire is wound around a surface of the heating core ceramic in a double helical manner, the heating core ceramic is heated, and the electric heating wire is made of a doped tungsten filament; the heat radiation shielding structure comprises an internal stainless steel shielding layer, a secondary external stainless steel shielding layer, an external stainless steel shielding layer, an upper stainless steel shielding layer, a secondary upper stainless steel shielding layer and a shielding base seat; inter-layer space between the internal stainless steel shielding layer, the secondary external stainless steel shielding layer and the external stainless steel shielding layer is filled with vacuum; a diameter ratio between the above three layers is determined via a heat loss equation. The heating device provided in the invention is high in heating efficiency, small in size and good in shielding effects; a problem that a conventional heating device affects normal work of the scanning electron microscope is overcome.

As the length of a cylinder of a magnetically shielding apparatus is shorter, the amount of magnetism of a component perpendicular to an axis of the cylinder which enters the opening portion of the cylinder is larger, resulting in a lower magnetic shield effect. A second magnetically shielding apparatus is formed in a cylinder with both ends or one direction close to an object to be measured being opened, and is disposed within a first magnetically shielding apparatus. An axial direction of the cylinder is substantially parallel to the magnetic flux density detection direction. The magnetic sensor, which conducts magnetic signal measurement and is disposed within the cylinder, is in the first magnetically shielding apparatus formed in a cylinder having both open ends, to thereby shield a magnetic flux density component that cannot be shielded by the first magnetically shielding apparatus by the periphery of the magnetic sensor.

A magnetic shunt is provided for magnetic shielding of a power device (e.g., a power transformer). The magnetic shunt includes magnetic flux collectors that are magnetically connected by a magnetically permeable bridge. The bridge is arranged between the magnetic flux collectors with one magnetic flux collector being placed at each end of the bridge. The cross-section of the magnetic flux collectors is larger than the cross-section of the bridge, and the magnetic shunt forms a single structural unit. A magnetic shunt arrangement and a power device which include magnetic shunts according to the present disclosure are also provided.