منابع مشابه
On Bicycle Tire Tracks Geometry, Hatchet Planimeter, Menzin's Conjecture, and Oscillation of Unicycle Tracks
The model of a bicycle is a unit segment AB that can move in the plane so that it remains tangent to the trajectory of point A (the rear wheel is fixed on the bicycle frame); the same model describes the hatchet planimeter. The trajectory of the front wheel and the initial position of the bicycle uniquely determine its motion and its terminal position; the monodromy map sending the initial posi...
متن کاملAs the Planimeter ’ s Wheel Turns : Planimeter Proofs for Calculus Class ∗
Tanya Leise ([email protected]) received her Ph.D. from Texas A&M University and is captivated by applied mathematics in many contexts, from accelerating cracks to biological clocks. Of particular interest to her recently has been the mathematics of mechanical devices such as astrolabes and planimeters, which are also great fun to collect. When not doing math, she enjoys cycling and sewing stu...
متن کاملDouble Hatchet Flap for the Reconstruction of Scalp Defects.
tion, and the lipidized DF, with a homogeneous yellowish area.3,6 Although initially considered rare, sebaceous structures are identified in more than 15% of DFs,4,5,7 even in multiple forms.8 This finding is typical in lesions localized in the anatomical area of the shoulder (shoulder, proximal region of the arm, upper back and deltoid region), being observed in more than 40% of these cases, p...
متن کاملEvolution in a Test Tube: The Hatchet before the Scalpel
Gene duplication provides an organism with a rich source of genetic material for tinkering by selection during evolution. In this issue, Rancati et al. (2008) report that extensive polyploidy and aneuploidy are the initial evolutionary changes in yeast selected in vitro to overcome defects resulting from the loss of a myosin II protein crucial for normal cytokinesis.
متن کاملVersatility of hatchet flaps for the repair of scalp defects.
There are a number of approaches for the repair of scalp defects, including local, regional, and distant options. The use of a local double triangular hatchet flap has numerous advantages due to its mixed rotational and advancement components, its large size, and the possibility of maintaining the cosmetic appearance of the hairline as the flap has similar characteristics to those of the area t...
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ژورنال
عنوان ژورنال: The Forestry Chronicle
سال: 1953
ISSN: 0015-7546,1499-9315
DOI: 10.5558/tfc29273-3