Date: Fri, 20 May 2011 13:55:52

Author: Jerry DiMarco

Subject: Re: Biophysics Demos?

Post:

I agree, there is needle movement on both sides of Wo. But how do
you explain all the oscillations on your ballistocardiograph? It looks
like 5 beats are shown but there are 3 smaller oscillations between each one...

Jerry
D


At 5/20/2011 11:04 AM, you wrote:
>Dick, I would say your answer is not quite correct. After the big dip,
>you can see the needle go slightly above the "resting" weight before
>going back to Wo. More like graph d, but with the down and up right
>next to each other.
>
>Another way to do the ballistocardiograph is to use two
>rods and a piece of plywood, a little mirror and a laser.
>It clearly shows the up and down motion, which corresponds
>to first less weight, then more. This is less damped than the
>scale so you can see more features of the heartbeat by spreading
>the signal horizontally or using video analysis
>http://www.physics.ucla.edu/demoweb/demomanual/mechanics/third_law/ballistocardiograph.html.
>
>Martin Simon
>
>On 5/20/2011 10:10 AM, Richard Berg wrote:
>>
>>Ballistocardiography - You only need an analog bathroom scale:
>>
>>http://www.physics.umd.edu/lecdem/outreach/QOTW/arch11/q203.htm
>>
>>Nice one for anyone - this topic is apparently becoming more relevant lately.
>>
>>Dick
>>
>>On Fri, 20 May 2011, Matthew Bobrowsky wrote:
>>
>>>
>>>Does anyone know of sources for purchasing (or ideas for constructing)
>>>demos related to biophysics?
>>>
>>>Thanks,
>>>Matt
>>>
>>>========================================
>>>Matthew Bobrowsky, Ph.D.
>>>Director, Lecture Demonstration Facility
>>>Department of Physics
>>>University of Maryland
>>>College Park, MD 20742-4111
>>>
>>>Tel: 301-405-6045
>>>E-mail: msb@umd.edu
>>>http://www.physics.umd.edu/lecdem/
>>>========================================
>>>
>>>
>>>
>>
>>***********************************************************************
>>Dr. Richard E. Berg, Professor of the Practice, Retired
>>Physics Lecture-Demonstration Facility
>>U.S. mail address:
>>Department of Physics
>>University of Maryland
>>College Park, MD 20742-4111
>>Phone: (301) 405-5994
>>FAX: (301) 314-9525
>>e-mail reberg@umd.edu
>>www.physics.umd.edu/lecdem
>>***********************************************************************
>>



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