2378 results about "Isosceles trapezoid" patented technology

The invention discloses a column-shaped electromagnetic wave stealth device with four-direction stealth effects. The column-shaped electromagnetic wave stealth device with the four-direction stealth effects comprises four first medium units and four second medium units, wherein the first medium units and the second medium units are isotropic and are transparent relative to incident electromagnetic waves, the refractive index of each first medium unit is larger than the refractive index of each second medium unit, the first medium units are column bodies, the cross sections of the column bodies are of isosceles triangle shapes, the second medium units are column bodies, and the cross sections of the column bodies are of isosceles triangle shapes or isosceles trapezoid shapes. Each second medium unit is arranged between every two adjacent first medium unit, adjacent second side walls are opposite to first side walls, and all third side walls face a stealth area. When the cross sections of the second medium units are of the isosceles triangle shapes, all fourth side walls face background media. When the cross sections of the second medium units are of the isosceles trapezoid shapes, all sixth side walls face the ground media and all seventh side walls face the stealth area. The column-shaped electromagnetic wave stealth device has the stealth effects of four directions, is insensitive to the polarization direction of the electromagnetic waves, and is suitable for a whole electromagnetic wave section.

The invention relates to an anti-slide pile of a jointed arch structure. The anti-slide pile of the jointed arch structure is formed by jointing a plurality of reinforced concrete single pile bodies and arch structures. The cross sections of the reinforced concrete single pile bodies are all isosceles trapezoids, and anti-slide teeth are arranged on the two side faces of each single pile body to form friction sections; one side of the longitudinal section of the short bottom side of the isosceles trapezoid serves as a pile rear end of the corresponding single pile body for bearing landslide thrust, one side of each pile rear end is a pressure bearing region, the longitudinal section of the long bottom side of each isosceles trapezoid serves as a pile front end, and one side of each pile front end is a tensile region; the arch structures are also reinforced concrete structures and are connected between every two single pile bodies, and the arch structures evenly transmit the landslide thrust among the single pile bodies to the two sides of the corresponding isosceles trapezoids. The friction sections of the anti-slide pile enhance the anti-slide effects of the side of the pile, and the anti-slide capacity of the anti-slide pile is improved. When the anti-slide pile of the jointed arch structure is used, an unequal distance distributing method is adopted, and jointed arch pile distance layout dense in the middle and thin on the two sides is formed. The anti-slide pile is large in overall rigidity, pile tip displacement is small, and pile distances can be enlarged properly to reduce the number of anti-slide piles and lower project construction cost.