October 2017 Issue, Volume 85, No. 10
Unmixing demonstration with a twist: A photochromic Taylor-Couette device
The featured article describes an updated version of the famous Taylor-Couette flow reversibility demonstration. The viscous fluid confined between two concentric cylinders is forced to move by the rotating inner cylinder and visualized through the transparent outer cylinder. After a few rotations, a colored blob of fluid appears well mixed. Yet, after reversing the motion for the same number of turns, the blob reappears in the original location as if the fluid has just been unmixed. The use of household supplies makes the device inexpensive and easy to build without specific technical skills. The device can be used for demonstrations in fluid dynamics courses and outreach activities to discuss the concepts of viscosity, creeping flows, the absence of inertia, and time-reversibility.
Editorial
A few words from the new editor by Richard H. Price. DOI: 10.1119/1.5000807
Guest Editorial
Is college teaching as a calling being impacted by research? by J. C. Sanders. DOI: 10.1119/1.4997024
Letter to the Editor
The Buron—The Elementary Particle of Bureaucracy by Dieter Schumacher. DOI: 10.1119/1.5000803
Papers
Resource Letter FCA-1: Frequency Combs and Applications by Dylan C. Yost. DOI: 10.1119/1.4997164
Incorporating current research into formal higher education settings using Astrobites by Nathan E. Sanders, Susanna Kohler, Chris Faesi, Ashley Villar, and Michael Zevin. DOI: 10.1119/1.4991506
Solutions of the Schroedinger equation for piecewise harmonic potentials: Remarks on the asymptotic behavior of the wave functions by Francisco D. Mazzitelli, Martín D. Mazzitelli, and Pedro I. Soubelet. DOI: 10.1119/1.4994808
Measurement of gravitational time dilation: An undergraduate research project by M. Shane Burns, Michael D. Leveille, Armand R. Dominguez, Brian B. Gebhard, Samuel E. Huestis more...DOI: 10.1119/1.5000802
Simulations in quantum tunneling by Kevin Smith and Guy Blaylock. DOI: 10.1119/1.4991367
Two and three particles interacting in a one-dimensional trap by MengXing Na, and Frank Marsiglio. DOI: 10.1119/1.4985063
The physics of a popsicle stick bomb by Jérémy Sautel, Andréane Bourges, Aude Caussarieu, Nicolas Plihon, and Nicolas Taberlet. DOI: 10.1119/1.5000797
NOTES AND DISCUSSIONS
Correction: Cover image caption [Am. J. Phys. 85(7), back cover (2017)] by David P. Jackson. DOI: 10.1119/1.5000838
Generalization of parallel axis theorem for rotational inertia by A. R. Abdulghany. DOI: 10.1119/1.4994835
APPARATUS AND DEMONSTRATION NOTES
Unmixing demonstration with a twist: A photochromic Taylor-Couette device by Enrico Fonda, and Katepalli R. Sreenivasan. DOI: 10.1119/1.4996901
BOOK REVIEWS
A Tale of Seven Scientists and a New Philosophy of Science by Michael D. Gordin. DOI: 10.1119/1.4996864
True Genius. The Life and Work of Richard Garwin, The Most Influential Scientist You've Never Heard Of by Cameron Reed. DOI: 10.1119/1.5001934
BOOKS RECEIVED
American Journal of Physics 85, 803 (2017); http://doi.org/10.1119/1.5000378
About AJP
General Information, Resources for Authors, Reviewers, and Readers
Additional Resources
 |