Development of wrapping paper with improved opacity, strength, and whiteness
نویسندگان
چکیده
منابع مشابه
Wrapping spheres with flat paper
We study wrappings of smooth (convex) surfaces by a flat piece of paper or foil. Such wrappings differ from standard mathematical origami because they require infinitely many infinitesimally small folds (“crumpling”) in order to transform the flat sheet into a surface of nonzero curvature. Our goal is to find shapes that wrap a given surface, have small area and small perimeter (for efficient m...
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Improved precision in polyhedral analysis with wrapping
Abstract interpretation using convex polyhedra is a common and powerful program analysis technique to discover linear relationships among variables in a program. However, the classical way of performing polyhedral analysis does not model the fact that values typically are stored as fixed-size binary strings and usually have wrap-around semantics in the case of overflows. In resource-constrained...
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What is the largest cube or sphere that a given rectangular piece of paper can wrap? This natural problem, which has plagued giftwrappers everywhere, remains very much unsolved. Here we introduce new upper and lower bounds and consolidate previous results. Though these bounds rarely match, our results significantly reduce the gap.
متن کاملImproving Fly Ash Whiteness and the Influence of Modified Fly Ash on the Physical Strength of Paper
In order to improve the whiteness of fly ash, the particles were coated by in-situ precipitation of calcium carbonate. After different mass ratios of calcium oxide to fly ash were mixed into water, a certain amount of carbon dioxide was bubbled into the mixture to form a precipitated calcium carbonate deposit on the surface of fly ash. With the help of scanning electron microscopy (SEM), the pr...
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ژورنال
عنوان ژورنال: Eastern-European Journal of Enterprise Technologies
سال: 2017
ISSN: 1729-4061,1729-3774
DOI: 10.15587/1729-4061.2017.109239