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WAVE MECHANICS De Broglie Comptes rendus 1923 note, with permission. Phase wave animation. |
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DEADLY DESIGNS Active infrared (IR) sensors for swinging doors. |
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EXPERT WITNESS Do you need an expert witness for an automatic door case? |
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EINSTEIN PHOTOGRAPHS A portfolio of photographs of Albert Einstein at Princeton University taken by Lotte Jacobi. |
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RELATED LINKS Links to door and sensor manufacturers, standards, etc. |
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REVOLVING DOOR KINETIC ENERGY Free Revolving Door kinetic Energy Calculator program (RDEC). Verify compliance with ANSI A156.27 national standard. Manual and FAQ included. |
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GRAVITATIONAL RADIATION Gravitational radiation in the Einstein, Brans-Dicke and Rosen bi-metric theories of gravity. |
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REVOLVING DOOR STANDARD FLAWED Kinetic energy equations in ANSI A156.27-2003 in error. Learn more. |
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REVOLVING DOOR DEFECTIVE DESIGN Kentucky appellate court affirms finding of revolving door defective design; absence of leading edge sensors. |
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DRAGON CURVES What is a Dragon curve? Download a plot of four interlocking Dragon curves, and free Dragon curve software. |
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RMFTL SOFTWARE RMFTLTM Row-oriented Multidimensional FFT Library. |
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PYTHAGOREAN THEOREM See the Pythagorean Theorem proven painlessly right before your eyes via animation. No mathematics required! |
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Davis Associates, Inc. • 43 Holden Road •
Newton, MA 02465 U.S.A. • 617-244-1450 • 617-964-4917 (Fax) Unsolicited advertisements not accepted at this Fax number and will be reported to the FCC. |