منابع مشابه
Cutting Out Polygons with a Circular Saw
Given a simple (cuttable) polygon Q drawn on a piece of planar material R, we cut Q out of R by a (small) circular saw with a total number of cuts no more than twice the optimal. This improves the previous approximation ratio of 2.5 obtained by Demaine et al. in 2001.
متن کاملPolygons Cuttable by a Circular Saw
We introduce and characterize a new class of polygons that models wood, stone, glass, and ceramic shapes that can be cut with a table saw, lapidary trim saw, or other circular saw. In this model, a circular saw is a line segment (in projection) that can move freely in empty space, but can only cut straight into a portion of material. Once a region of material is separated from the rest, it can ...
متن کاملOn a Singular Perturbation Problem Involving a “circular-well” Potential
We study the asymptotic behavior, as a small parameter ε goes to 0, of the minimizers for a variational problem which involves a “circularwell” potential, i.e., a potential vanishing on a closed smooth curve in R2. We thus generalize previous results obtained for the special case of the GinzburgLandau potential.
متن کاملEffect of Yield Strength of a Circular Saw Blade on the Multi-spot Pressure Tensioning Process
In this study, a numerical model of the tangential tensioning stress distribution of a circular saw blade tensioned by multi-spot pressure was established using theoretical analysis, and the tangential tensioning stress distribution of the circular saw blade calculated by the model was shown to be true and reliable. The effect of yield strength of the circular saw blade on the distribution of t...
متن کاملA Newly-developed Model for Predicting Cutting Power during Wood Sawing with Circular Saw Blades
In the classical approach, cutting forces and cutting power in sawing processes of orthotropic materials such as wood are generally calculated on the basis of the specific cutting resistance kc (cutting force per unit area of cut). For every type of sawing kinematics (frame saws, band saws and circular sawing machines) different empirical values of specific cutting resistance kc have to be appl...
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ژورنال
عنوان ژورنال: The Boston Medical and Surgical Journal
سال: 1861
ISSN: 0096-6762,1533-4406
DOI: 10.1056/nejm186104040640904