have you heard about negative resistance??

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in the research , i find the transducer's equation insists a negative resistance. it sounds strange to me, did you heard of that before?

Our Martians are beginning to learn AVR

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Yes, Negative Resistance exists. This is the resistance seen looking into most oscillators when the resonator is removed. You can make negative resistance with an op-amp. Tunnel Diodes also have negative resistance.

I do not understand your phrase

Quote:
the transducer's equation insists a negative resistance
What do you mean by this.

Jim

 

Until Black Lives Matter, we do not have "All Lives Matter"!

 

 

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for the research, someone have calculated that the transducer's (mechanical)characterist can be changed into electrical characterist ,like resistance, capacitance and inductance to be expressed. here, one of the parallel loop is a resistance which shows the negative characterist.
by the way, we will paid the one who can teach us English,the salary is high in Mars, and we can settle with your registered permanent residence problem, and Hamburger freely everyday

Our Martians are beginning to learn AVR

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Quote:

we can settle with your registered permanent residence problem, and Hamburger freely everyday

No offence but ... Intentional or not, this got me LOL!

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"Some questions have no answers."[C Baird] "There comes a point where the spoon-feeding has to stop and the independent thinking has to start." [C Lawson] "There are always ways to disagree, without being disagreeable."[E Weddington] "Words represent concepts. Use the wrong words, communicate the wrong concept." [J Morin] "Persistence only goes so far if you set yourself up for failure." [Kartman]

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There's a very good article on Wikipedia. That's a link to the English version but no doubt the Martian language site also has an article.

"The chances of anything coming from Mars are a million to one", he said.

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I am the one of a million

Our Martians are beginning to learn AVR

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Quote:

I am the one of a million

Nice to get that verified. We hoped and suspected that it was so, but where not certain... :wink:

As of January 15, 2018, Site fix-up work has begun! Now do your part and report any bugs or deficiencies here

No guarantees, but if we don't report problems they won't get much of  a chance to be fixed! Details/discussions at link given just above.

 

"Some questions have no answers."[C Baird] "There comes a point where the spoon-feeding has to stop and the independent thinking has to start." [C Lawson] "There are always ways to disagree, without being disagreeable."[E Weddington] "Words represent concepts. Use the wrong words, communicate the wrong concept." [J Morin] "Persistence only goes so far if you set yourself up for failure." [Kartman]

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Don't the Martians have a large colony in eastern asia with 2 billion colonists?

Imagecraft compiler user

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Back to the original question:

Strange things do appear when one tries to find electrical analogs to mechanical properties. First, a transducer has very proper electrical characteristics. They can be measured. For a transducer, resistance represents (mostly) the electrical energy that is either converted to heat within the transducer OR is lost through the tranducer conversion mechanism (to outgoing mechanical energy).

It is very possible that the person making this model (that is what it IS) is not interpreting energy flow correctly. If one expects power to flow in one direction and it really flows in the opposite direction, the resistance will appear negative. For example, if you think that the transducer should absorb electrical power, but really creates electrical power (perhaps from mechanical input), it will appear to be a negative resistance device.

Jim

 

Until Black Lives Matter, we do not have "All Lives Matter"!

 

 

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By the way, this is the poster from China who has asked about AC coupling capacitors for oscilloscopes that don't seem to work, about ultrasonic transducers, and has said that he used cracked software because he is a student who cannot offord the real stuff.

I am willing to try to help with genuine technical problems.

Jim

 

Until Black Lives Matter, we do not have "All Lives Matter"!

 

 

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All a martian needs to know about negative resistance in vacuum field effect devices... http://vintageradio.me.uk/novice/rfpentode.htm