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WAVE MECHANICS
De Broglie Comptes rendus 1923 note, with permission. Phase wave animation.
DEADLY DESIGNS
Active infrared (IR) sensors for swinging doors.
EXPERT WITNESS
Do you need an expert witness for an automatic door case?
EINSTEIN PHOTOGRAPHS
A portfolio of photographs of Albert Einstein at Princeton University taken by Lotte Jacobi.
RELATED LINKS
Links to door and sensor manufacturers, standards, etc.
REVOLVING DOOR KINETIC ENERGY
Free Revolving Door kinetic Energy Calculator program (RDEC).   Verify compliance with ANSI A156.27 national standard.   Manual and FAQ included.
GRAVITATIONAL RADIATION
Gravitational radiation in the Einstein, Brans-Dicke and Rosen bi-metric theories of gravity.
REVOLVING DOOR STANDARD FLAWED
Kinetic energy equations in ANSI A156.27-2003 in error. Learn more.
REVOLVING DOOR DEFECTIVE DESIGN
Kentucky appellate court affirms finding of revolving door defective design; absence of leading edge sensors.




DRAGON CURVES
What is a Dragon curve? Download a plot of four interlocking Dragon curves, and free Dragon curve software.
RMFTL SOFTWARE
RMFTLTM Row-oriented Multidimensional FFT Library.
PYTHAGOREAN THEOREM
See the Pythagorean Theorem proven painlessly right before your eyes via animation. No mathematics required!
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