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Impedance

Impedance

1. Total opposition to flow. When flow is steady, impedance is simply the resistance, e.g., the driving pressure per unit flow; when flow is changing, impedance also includes the factors that oppose changes in flow. Thus, deviations of impedance, from simple ohmic resistance because of the effects of capacitance and inductance, become more important in alternating current as the frequency of oscillations increases. In fluid analogies (e.g., pulsatile flow of blood, to-and-fro flow of respiratory gas), impedance depends not only on viscous resistance but also upon compressibility, compliance, inertance, and the frequency of imposed oscillations.

2. Resistance of an acoustic system to being set in motion.


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Neve signal amplication

You can't equate an axon with a wire - it's not the same kind of flow, so a property like impedance can't be applied the same way.

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by Darby
Tue Mar 06, 2007 4:41 pm
 
Forum: Physiology
Topic: Neve signal amplication
Replies: 14
Views: 9853

Neve signal amplication

Now its clear, to many extend actually I am working on impedance that signals in nerve amplified but no impedance produced why.. ur answer has resolved this to many extend, I'll think on it further if any hurdle come across again than I'll be here again. ...

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by Abu Anzar
Mon Mar 05, 2007 5:48 pm
 
Forum: Physiology
Topic: Neve signal amplication
Replies: 14
Views: 9853

Neve signal amplication

I am not amplifying signal right now may be after 3 yrs and 10 months.. actually I asked this for raising a question which is based on impedance. I'll ask here very soon just by collecting some material on signal amplification. Thanks for presentation Dr. Stein and Darby for replying

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by Abu Anzar
Mon Mar 05, 2007 8:40 am
 
Forum: Physiology
Topic: Neve signal amplication
Replies: 14
Views: 9853

The Fiber Disease

... studying and improving the antenna robustness in a given environment. The most important parameters to investigate are the antenna efficiency and impedance, and for EMC problems, the transfer function (S21). These parameters will during the project be estimated as function of geometry, materials ...

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by London
Thu Dec 28, 2006 2:44 am
 
Forum: Human Biology
Topic: The Fiber Disease
Replies: 7403
Views: 5560032

The Fiber Disease

... it is present, the gates swing shut, electrical flow from one side of the membrane to the other slows, and the electrode registers a change in impedance. Importantly, the change is proportional to the amount of drug in the sample. So is cost. Current affinity sensors cost $100,000 or more. ...

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by Maggie Mae
Sat Dec 09, 2006 4:26 am
 
Forum: Human Biology
Topic: The Fiber Disease
Replies: 7403
Views: 5560032
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