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- May 26, 2010
- 04:00 AM
- 438 views
Design of an inexpensive digital anemometer
by Evaristo Rojas Mayoral in Octopodo
If you put a pendulum under the influence of a flow, a drag force will move the pendulum creating an angle with respect to the vertical. As the angle is related to the drag force, and because the drag force is related to the velocity of the flow, you can determine the velocity of the flow by only measuring the angle of the pendulum.
You could measure the angle with a protractor, but what we decided to do is to attach a large, light ball to the top of the pendulum and to register the rotation ........ Read more »
Hernández-Walls, R., Rojas-Mayoral, E., Baéz-Castillo, L., & Rojas-Mayoral, B. (2008) Design and calibration of an inexpensive digital anemometer. Physics Education, 43(6), 593-598. DOI: 10.1088/0031-9120/43/6/005
- May 24, 2009
- 06:00 AM
- 265 views
Coeficiente de Correlación Circular
by Evaristo Rojas Mayoral in Octópodo
Un coeficiente de correlación es un número que describe algunas características de la relación entre dos variables. Existen diversos coeficientes de correlación, cada uno diseñado para analizar algún tipo de datos en particular.
Un Coeficiente de Correlación Circular (CCC) mide la asociación entre dos variables angulares.
Las variables angulares, cuyos valores son direcciones, se expresan en radianes (o grados) y tienen como característica que para cualquier dirección dada, don........ Read more »
FISHER, N., & LEE, A. (1983) A correlation coefficient for circular data. Biometrika, 70(2), 327-332. DOI: 10.1093/biomet/70.2.327
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