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May 02, 2025, 05:56:47 pm
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Author Topic: Help  (Read 1464 times)  Share 

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naved_s9994

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Help
« on: June 08, 2009, 10:06:46 am »
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how do you calculate the potential energy stored in a material under load (strain energy) using area under stress
versus strain graph
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kurrymuncher

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Re: Help
« Reply #1 on: June 08, 2009, 10:25:44 am »
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Just calculate the area under the graph by counting squares and then multiply that by the volume of the material given.
Normally they would be traingles anyway so just use bh/2
« Last Edit: June 08, 2009, 10:34:32 am by kurrymuncher »
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appianway

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Re: Help
« Reply #2 on: June 08, 2009, 10:33:03 am »
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Yes.
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naved_s9994

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Re: Help
« Reply #3 on: June 08, 2009, 11:01:52 am »
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Intensity modulation , any explanation...or diagram or reference..Thanks
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naved_s9994

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Re: Help
« Reply #4 on: June 08, 2009, 11:33:02 am »
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any1?
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appianway

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Re: Help
« Reply #5 on: June 08, 2009, 12:35:42 pm »
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This is what my textbook says:

"Intensity (or amplitude) modulation is when the
intensity of a light beam varies in accordance with
the fluctuations in the amplitude of the information
signal."


In short, the brightness of the signal being sent varies in accordance with the amplitude of the input signal. In amplitude modulation, the information signal is added to a carrier wave for transmission. As the carrier wave is known, this can be subtracted in the demodulation process.

There's also a wikipedia page:
http://en.wikipedia.org/wiki/Amplitude_modulation
 
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naved_s9994

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Re: Help
« Reply #6 on: June 08, 2009, 01:45:53 pm »
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tnx apian
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TrueTears

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Re: Help
« Reply #7 on: June 08, 2009, 03:50:22 pm »
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You might find this helpful.
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Interested in asset pricing, econometrics, and social choice theory.

simplicity123

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Re: Help
« Reply #8 on: June 08, 2009, 04:04:19 pm »
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Regarding the diagram in that word document, would it make a difference if the demodulator was a LDR instead of a photodiode? I know that it has a slower response time and stuff but would examiners mark you wrong for that? Because technically it too is a opto-electro converter.
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TrueTears

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Re: Help
« Reply #9 on: June 08, 2009, 04:08:10 pm »
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Quote from: simplicity123 on June 08, 2009, 04:04:19 pm
Regarding the diagram in that word document, would it make a difference if the demodulator was a LDR instead of a photodiode? I know that it has a slower response time and stuff but would examiners mark you wrong for that? Because technically it too is a opto-electro converter.
Yeah it can be a LDR.
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PhD @ MIT (Economics).

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appianway

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Re: Help
« Reply #10 on: June 08, 2009, 04:16:45 pm »
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I thought that the demodulator had to be linear, but maybe someone just told me the wrong information.
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VxBlitzxN

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Re: Help
« Reply #11 on: June 08, 2009, 04:17:43 pm »
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Quote from: simplicity123 on June 08, 2009, 04:04:19 pm
Regarding the diagram in that word document, would it make a difference if the demodulator was a LDR instead of a photodiode? I know that it has a slower response time and stuff but would examiners mark you wrong for that? Because technically it too is a opto-electro converter.

Since they are slow to respond, it makes them a bad for transmission. That's why the photodiode is more practical in these sorts of applications.
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naved_s9994

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Re: Help
« Reply #12 on: June 08, 2009, 06:09:20 pm »
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thanks true tears !!
Your such a sport mate !

Great JOB ! and thanks for all support in lead up to this exam tommorow
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