منابع مشابه
As 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 کاملUse of an Optical Planimeter for Measuring Leaf Area.
The rapid, accurate measurement of area in biological materials of varying colors, textures, and shapes is of special concern to the plant scientist. The need for the measurement of leaf area, in particular, has prompted the search for newer and faster methods in recent years. In general, leaf area is an excellent indicator of the photosynthetic capacity of a plant and the measurement of such a...
متن کاملRolling perception without rolling motion.
The texture of a rolling circle depicts the translational and rotational components of its motion. In the case of a homogeneous circle, however, visual cues to the rotational component of motion are absent. To examine how the visual system resolves undetermined motion cues, optically neutral circles were displaced so that changes in their orientation were invisible. Contextual cues systematical...
متن کاملSignificance of Heat Conduction Parameter along the Rolling Direction in the Thermal Modeling of the Hot Rolling Process
Obtaining temperature distribution data of slabs under rolling is essential as the mechanical and metallurgical properties of the metal under this process vary with temperature. Using the control volume method, a mathematical model is employed in this study to predict slab temperature in the hot roll process at Mobarakeh Steel Company. The effects of different parameters including the heat resu...
متن کاملThe Discovery of Rolling Circle Amplification and Rolling Circle Transcription.
Nucleic acid amplification is a hugely important technology for biology and medicine. While the polymerase chain reaction (PCR) has been highly useful and effective, its reliance on heating and cooling cycles places some constraints on its utility. For example, the heating step of PCR can destroy biological molecules under investigation and heat/cool cycles are not applicable in living systems....
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ژورنال
عنوان ژورنال: Scientific American
سال: 1885
ISSN: 0036-8733
DOI: 10.1038/scientificamerican04251885-7756dsupp