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227 results about "Geometric design" patented technology

Geometric design (GD) is a branch of computational geometry. It deals with the construction and representation of free-form curves, surfaces, or volumes and is closely related to geometric modeling. Core problems are curve and surface modelling and representation. GD studies especially the construction and manipulation of curves and surfaces given by a set of points using polynomial, rational, piecewise polynomial, or piecewise rational methods. The most important instruments here are parametric curves and parametric surfaces, such as Bézier curves, spline curves and surfaces. An important non-parametric approach is the level-set method.

Surface protection system

An surface protection system of manufacture for protecting the surfaces, including restroom floors, from accidental liquid spills, including urine and water, with a top unit containing grid work of any geometric design containing a slip resistance top design that directs liquid down and into the absorbing core; an absorbing core attached to the top unit by any method, consisting of non woven material containing super absorbent polymer or super absorbent fiber, or similar material that has a high rate of absorbency and capacity to retain the liquid in the material; a moister barrier attached to the absorbing core and the top unit by any permanent means, including glue, heat welding, or other methods, and optionally, a backing unit containing slip resistant characteristics. All components being combined into one surface protection system that also provides for the user to stand on a portion of it, allowing a closer position to a urinal, toilet, beverage machine, drinking fountain, or other intended use of the surface protection system. An article of manufacture for protecting the counter surfaces from accidental liquid spills, including coffee, carbonated beverages, and water, with a top unit containing grip work grid work of any geometric design containing a slip resistance top design that directs liquid down and into the absorbing core; an absorbing core attached to the top unit by any method, consisting of non woven material containing super absorbent polymer or super absorbent fiber, or similar material that has a high rate of absorbency and capacity to retain the liquid in the material; a moister barrier attached to the absorbing core and the top unit by any permanent means, including glue, heat welding, or other methods, and optionally, a backing unit containing slip resistant characteristics. All components being combined into one surface protection system that also provides for the user to stand on a portion of it, allowing a closer position to a urinal, toilet, beverage machine, drinking fountain, or other intended use of the surface protection system.
Owner:WATERMAN WADE RICHARD +1

Reverse design method for impeller of centrifugal pump

InactiveCN101520052AOvercoming the Definition of GeometryOvercome many inconveniences such as modificationPump componentsPumpsBoundary value problemThree-dimensional space
The invention discloses a reverse design method for an impeller of a centrifugal pump, which comprises the following steps: according to a given impeller axial plane, a blade in a three-dimensional space can be actually expressed as X=X(z(u, v), r(u, v), theta(u, v)), the (z(u, v), r(u, v)) has been determined when a streamline of the impeller axial plane is given, and the space modeling of the blade can be determined by determining the theta(u, v) on the impeller axial plane. The reverse design method is characterized in that the reverse design method transforms a geometric design problem of the blade of the centrifugal pump into a boundary value problem of a partial differential equation to solve under the condition of the given impeller axial plane of the centrifugal pump. The reverse design method overcomes a lot of disadvantages such as the definition and modification of geometrical shape of the blade in the prior design method, can realize the parametric design of the blade, overcome the defects existing when a fussy two-dimensional form drawing is used for showing three-dimensional twisted blades in the prior method, can closely combine the hydraulic design of hydraulic machinery, three-dimensional solid modeling and the CFD analysis of flow field, and realize the quick and accurate solving of the reverse problem of the blade.
Owner:LANZHOU UNIVERSITY OF TECHNOLOGY
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