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370results about How to "Protection wear" patented technology

Broadband terahertz linear polarization wave asymmetric transmission device based on metamaterial

The invention discloses a broadband terahertz linear polarization wave asymmetric transmission device based on a metamaterial, and belongs to the field of transmission control devices of electromagnetic waves. The device comprises several basic units which are periodically arranged on an xy plane in the same direction, wherein each basic unit comprises five layers of structures which are arrangedsequentially, namely the dielectric layer 1, the metal layer 2, the dielectric layer 3, the metal layer 4 and the dielectric layer 5 from top to bottom in sequence, and the thickness of the dielectriclayer 3 is generally far larger than the that of the dielectric layer 1 and the dielectric layer 5; the metal layer 2 and the metal layer 4 are metal graphs which are constituted at the two sides ofthe dielectric layer 3 through technologies like photoetching or electron beam lithography; the graph constituted by the metal layer 4 is obtained by rotating the graph of the metal layer 2 by 90 degrees along the axis or through mirror symmetry. Dielectric film at the upper layer and the lower layer can be used for protecting the metal layers against abrasion and the stability of the device. Thebroadband terahertz linear polarization wave asymmetric transmission device is simple in structure and easy to prepare; one-way transmission of broadband terahertz linear polarization conversion is effectively achieved, and the device has an important significance in developing terahertz functional devices.
Owner:BEIJING UNIV OF POSTS & TELECOMM

Personnel guidance and location control system

A personnel location control system for controlling and guiding a group of individuals in a selected path to a waiting point and then to an activity in advance of that waiting point. The system in one embodiment relies upon a plurality of disks or like guide path-forming elements which define the edges of a desired guide path for a line of individuals waiting to reach the activity or destination. These elements may be physically mounted on a ground cover substrate where a single substrate or a plurality of similar substrates in combination, could form a desired guide path. Thus, some of the ground substrates may define arcuate guide path sections and others may define straight guide path sections, etc., but which when combined will form a total guide path. Thus, modular carpet substrates or sections could be provided and each of these carpet sections would be capable of being secured to a ground or floor surface. In another embodiment, the guide forming elements may be integrally formed in the carpet substrates. Further, the guide forming elements may be individual carpet pieces which are located in holes formed in the carpet substrates. Thus, the various carpet substrates could all be pre-formed and merely secured to a floor at a desired location.
Owner:PHARO DAN +1

Multi-metal composite wear-resistant elbow pipe and preparation method thereof

The invention discloses a multi-metal composite wear-resistant elbow pipe and a preparation method thereof, wherein the inner side wall of the elbow pipe is formed through the composition of carbon cast steel on an outer layer and high-chromium iron on an inner layer, and is characterized in that the outer side wall of the elbow pipe is formed through the composition of three layers of different materials, namely a carbon cast steel outer layer (1), a high-chromium iron intermediate layer (2) and a wolfram carbide particle ceramic inner layer (3); the preparation method of the multi-metal composite wear-resistant elbow pipe comprises the following steps: foam model making, painting and baking, elbow pipe outer layer model packing, smelting, sand box vacuum pumping and pouring, taking out and cleaning castings on a carbon cast steel outer layer of the elbow pipe, elbow pipe interlayer model assembling, wolfram carbide particulate material paste painting, coating painting and baking, binning, smelting, sand vacuum pumping and pouring, taking elbow pipe castings out, cleaning and detecting, heat treating to the elbow pipe castings, detecting the hardness of the end surface of the multi-metal composite wear-resistant elbow pipe, and then warehousing; the prepared multi-metal composite wear-resistant elbow pipe has the advantages that the comprehensive mechanical property is excellent, the service life is long, the manufacturing technology is advanced, the maintenance and the installation are convenient, and a wide cost performance competition space is provided.
Owner:YANTAI BRANCH NO 52 INST OF CHINA NORTH IND GRP
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