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920 results about "Projected area" patented technology

Projected area is two-dimensional area measurement of a three-dimensional object by projecting its shape on to an arbitrary plane. This is often used in mechanical engineering and architectural engineering related fields, specifically hardness testing, axial stress, wind pressures, and terminal velocity. The geometrical definition of a projected area is: "the rectilinear parallel projection of a surface of any shape onto a plane".

Analysis and evaluation method for inrush mountain torrent disasters of regions without data

The invention discloses an analysis and evaluation method for inrush mountain torrent disasters of regions without data, and relates to the field of mountain torrent disaster analysis and evaluation. The method comprises the steps that the basic information of a project area is obtained; the landform, the river position form and the flood control current situation of an evaluated object are obtained; the catchment area and runoff components of the dike confluence drainage basin of each small watershed in the obtained evaluated object are determined; rainstorm parameter calculation, rainstorm calculation and concentration-time-based rainstorm time interval distribution of the evaluated object are obtained; flood calculation is designed, and the water level and flow relation of a riverway section, prone to inrush, of the evaluated object is obtained; the riverway flood control current situation in the evaluated object is determined, and accordingly danger zone grade division is conducted; and an early warning point is established, the early warning water level of the analyzed and evaluated object is determined, and the early warning index of the analyzed and evaluated object is formulated. According to the analysis and evaluation method, the inrush mountain torrents serves as the main analyzed and evaluated object, and a current riverway flood control current situation evaluation method and an early warning index analysis method are provided.
Owner:CHINA INST OF WATER RESOURCES & HYDROPOWER RES

Buckling and energy consumption preventing steel plate shear wall

The invention involves a kind of data organization project area of technology to guard against the flexure to consume energy the steel plate shearing force wall. Its characteristic causes to state the shearing force wall to inlay the steel plate and two sides periphery concrete lap by in is composed; In states inlays the steel plate to use the low yield point high ductility steel products or the high strength high ductility steel products; States the periphery concrete lap to use the common concrete slab; States the edge component is composed by the marginal beam and the edge column; In states inlays the steel plate with to state between the concrete lap through to penetrate three blocks the bolts or the pre-stressed bold fastening, in states on the concrete lap to open the ellipse hole in order to the bolt passed through also has the enough slipping space; In states the concrete lap to open the hole site with to bury the trough section to give strengthens. And is strengthening the channel steel the corresponding position to open oval hole. The invention provides guards against the flexure steel plate shearing force wall is the high-rise construction structure or other structures a kind of new anti- lateral force components, it has the earthquake resistance performance well, the ductility is high, consumes energy stagnates winds full and so on the characteristic, is a kind of superior earthquake resistance consumes energy the component.
Owner:TSINGHUA UNIV

Head up display device based on laser holographic projection imaging

The invention discloses a head up display device based on laser holographic projection imaging, and the head up display device based on laser holographic projection imaging belongs to the field of auxiliary display. The head up display device based on laser holographic projection imaging mainly comprises a light source system, an image processing system, a spatial light modulation module and an optical light path system. First, the image processing system receives to-be-displayed content through a data interface and transforms the content into a hologram form through a hologram conversion algorithm, or selects the to-be-displayed hologram stored in the system to perform simple arithmetic processing according to external inputted information, or directly outputs and displays on the spatial light modulation module; second, one (monochromatic) or a plurality of (chromatic) laser beams are emitted on the spatial light modulation module, and an original image is formed through diffraction in front of the spatial light modulation module; and last, the optical light path system is used for magnifying the imaged restored through diffraction to increase the field angle of the image. The head up display device based on laser holographic projection imaging can realize real-time dynamic adjustment of imaging distance, and the brightness of the displayed content can be changed in real time according to the ratio of the projection content area to the total projection area.
Owner:JIANGSU INTELIGHT ELECTRONICS TECH
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