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James Brownridge

Nuclear Instruction Specialist and Radiation Safety Officer
Office: S2-506
Phone: 607-777-4370


  • Supercooling and freezing dirty water (Youtube video | Powerpoint presentation
  • When Does hot water freeze faster then cold water? A search for Mpemba Effect published in American Journal of Physics -- January 2011 -- Volume 79, Issue 1, pp. 78 ranks 4th in the list of the most downloaded research article.
  • Mpemba Effect (updated March 9, 2010)
  • Demonstration of Electrons Focused and Accelerated by a Pyroelectric Crystal. You observe FIRST Gas Induced Discharge Now! Watch the Video.
  • R&D 100 Magazine's Award for Pyroelectric X-Ray Generator- COOL-X.
  • Presentation made at the Conference on the Physics, Chemistry and Biology of Water in Bulgaria, October 2013 (.pdf, 7.16MB) 

Areas of Research:

  • Pyroelectric crystal focused electron beams
  • X-ray production by pyroelectric crystals
  • Radiation production and detection
  • Electron and ion acceleration by pyroelectric crystals
  • Development of miniature portable pyroelectric crystal x-ray generators
  • Profiling elements in tree leaves
  • Environmental monitoring of radioactive nuclides

Principal Collaborators:

Stephen M. Shafroth
Professor of Physics Emeritus
University of North Carolina at Chapel Hill
Chapel Hill, NC 27599-3255

Links to Similar Work:

Mpemba Effect

Jim Brownridge on Mpemba Effect (pdf, 253kb)

Last Updated: 10/6/16