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Author Topic:   Improving on nature ... by design ...
RAZD
Member (Idle past 1522 days)
Posts: 20714
From: the other end of the sidewalk
Joined: 03-14-2004


Message 1 of 19 (120150)
06-29-2004 8:00 PM


Improving on nature ... by design ...

Philips’ Fluid Lenses Bring Things into Focus (click for full article)
The Philips FluidFocus lens consists of two immiscible (non-mixing) fluids of different refractive index (optical properties), one an electrically conducting aqueous solution and the other an electrically non-conducting oil, contained in a short tube with transparent end caps. The internal surfaces of the tube wall and one of its end caps are coated with a hydrophobic (water-repellent) coating that causes the aqueous solution to form itself into a hemispherical mass at the opposite end of the tube, where it acts as a spherically curved lens.
The shape of the lens is adjusted by applying an electric field across the hydrophobic coating such that it becomes less hydrophobic — a process called ‘electrowetting’ that results from an electrically induced change in surface-tension. As a result of this change in surface-tension the aqueous solution begins to wet the sidewalls of the tube, altering the radius of curvature of the meniscus between the two fluids and hence the focal length of the lens. By increasing the applied electric field the surface of the initially convex lens can be made completely flat (no lens effect) or even concave. As a result it is possible to implement lenses that transition smoothly from being convergent to divergent and back again.
Now that is not something that nature has evolved, but it is evidence of a good design.
New style contacts soon? Telescopic eyes?
Imagine people with damaged corneas able to focus light onto the parts that are still good and see a more complete picture ... ?
Enjoy.
This message has been edited by RAZD, 01-03-2005 20:11 AM

we are limited in our ability to understand
by our ability to understand
RebelAAmerican.Zen[Deist
{{{Buddha walks off laughing with joy}}}

Replies to this message:
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AdminNosy
Administrator
Posts: 4754
From: Vancouver, BC, Canada
Joined: 11-11-2003


Message 2 of 19 (120185)
06-29-2004 11:20 PM


Thread moved here from the Proposed New Topics forum.

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RAZD
Member (Idle past 1522 days)
Posts: 20714
From: the other end of the sidewalk
Joined: 03-14-2004


Message 3 of 19 (120188)
06-29-2004 11:33 PM
Reply to: Message 2 by AdminNosy
06-29-2004 11:20 PM


eye design
I was kinda thinking of ID ... heh. but this is cool.

we are limited in our ability to understand
by our ability to understand
RebelAAmerican.Zen[Deist
{{{Buddha walks off laughing with joy}}}

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Nasa
Inactive Member


Message 4 of 19 (120192)
06-29-2004 11:51 PM


Cool invention. The shaping of the lens is indeed found in many created kinds. Not sure on the chemical reactions, or electrical energy loss, being more advanced.

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Nasa
Inactive Member


Message 5 of 19 (120195)
06-29-2004 11:55 PM


We are limited in our ability to understand
by our ability to understand?
Not so sure, we are limited in our ability to understand, by the lack of our willing-ness to ask.- The one who knows.

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RAZD
Member (Idle past 1522 days)
Posts: 20714
From: the other end of the sidewalk
Joined: 03-14-2004


Message 6 of 19 (120205)
06-30-2004 12:44 AM
Reply to: Message 5 by Nasa
06-29-2004 11:55 PM


that would depend on our ability to know it is okay to ask those that know, know what I mean?

we are limited in our ability to understand
by our ability to understand
RebelAAmerican.Zen[Deist
{{{Buddha walks off laughing with joy}}}

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RAZD
Member (Idle past 1522 days)
Posts: 20714
From: the other end of the sidewalk
Joined: 03-14-2004


Message 7 of 19 (120208)
06-30-2004 12:48 AM
Reply to: Message 4 by Nasa
06-29-2004 11:51 PM


Shaping the lens is done by constricting relaxing muscle around the lens, not by adding or removing liquid inside.
Not an evolved method. Has greater range available ...
Muscle action is electrical
(fixed typo, time for bed ...)
This message has been edited by RAZD, 06-29-2004 11:49 PM

we are limited in our ability to understand
by our ability to understand
RebelAAmerican.Zen[Deist
{{{Buddha walks off laughing with joy}}}

This message is a reply to:
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Loudmouth
Inactive Member


Message 8 of 19 (120238)
06-30-2004 1:44 AM
Reply to: Message 7 by RAZD
06-30-2004 12:48 AM


quote:
Muscle action is electrical
Just a quick correction. Muscle contraction is driven by ATP, it is a chemical reaction. The contraction is stimulated by a release of ions from nerves. Although there is a voltage difference across the membrane, nerve impulses are actually driven by the release of positive ions as compared to electrical impulses which are travelling electrons. However, electrical currents can cause the release of these ions and mimic the effect of a nerve impulse. Just a pet peeve, but I hate it when people say that nerve impulses are electricity. If this were true then people would have to explain why nerve impulses only travel at 50-70 meters per second as compared to electricity which travels at 300,000,000 meters per second.

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coffee_addict
Member (Idle past 594 days)
Posts: 3645
From: Indianapolis, IN
Joined: 03-29-2004


Message 9 of 19 (120241)
06-30-2004 1:57 AM
Reply to: Message 8 by Loudmouth
06-30-2004 1:44 AM


Loudmouth writes:
Just a pet peeve, but I hate it when people say that nerve impulses are electricity.
And you think this is bad? I had to try to convince a bunch of high schoolers that the idea behind the Matrix (the movie) regarding turning people into batteries is that the machines were interested in our body heat to use for some kind of chemical reaction. These kids really thought that the machines were actually using people's "electric currents" in their brains. They justified this by pointing out that the machines did not decide to use cows because cows are less intelligent, thus their brains create a lot less electricity.
Regarding the body heat argument, you have to watch the animatrix: second renaisance to know what I'm talking about.

The Laminator

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Dr Jack
Member
Posts: 3514
From: Immigrant in the land of Deutsch
Joined: 07-14-2003


Message 10 of 19 (120290)
06-30-2004 6:33 AM
Reply to: Message 8 by Loudmouth
06-30-2004 1:44 AM


Although there is a voltage difference across the membrane, nerve impulses are actually driven by the release of positive ions as compared to electrical impulses which are travelling electrons
Pedant's note: actually electrical impulses are transmitted via electrical fields rather than by the motion of electrons.

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RAZD
Member (Idle past 1522 days)
Posts: 20714
From: the other end of the sidewalk
Joined: 03-14-2004


Message 11 of 19 (120318)
06-30-2004 9:09 AM
Reply to: Message 8 by Loudmouth
06-30-2004 1:44 AM


exchange of ions is still electrical -- the attraction of the ions is driven by the different electrical charges.
a reason I said electrical rather than electricity.
curious that current is portrayed moving in the opposite direction to the flow of electrons, because ol' Ben thought it was the movement of positive particles ...

we are limited in our ability to understand
by our ability to understand
RebelAAmerican.Zen[Deist
{{{Buddha walks off laughing with joy}}}

This message is a reply to:
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contracycle
Inactive Member


Message 12 of 19 (120703)
07-01-2004 9:04 AM
Reply to: Message 1 by RAZD
06-29-2004 8:00 PM


Todays trivia: suspended-oil lenses were actually the technology behind Luke Skywalkers binocular-type thingies in the first Star Wars film.

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jar
Member
Posts: 34136
From: Texas!!
Joined: 04-20-2004
Member Rating: 3.4


Message 13 of 19 (120723)
07-01-2004 9:37 AM
Reply to: Message 12 by contracycle
07-01-2004 9:04 AM


Todays trivia #2
Read Dune.

Aslan is not a Tame Lion

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RAZD
Member (Idle past 1522 days)
Posts: 20714
From: the other end of the sidewalk
Joined: 03-14-2004


Message 14 of 19 (120821)
07-01-2004 12:51 PM
Reply to: Message 13 by jar
07-01-2004 9:37 AM


technology
both of these are technologies hypothesized in science fiction and not natural organic developments.

we are limited in our ability to understand
by our ability to understand
RebelAAmerican.Zen[Deist
{{{Buddha walks off laughing with joy}}}

This message is a reply to:
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jar
Member
Posts: 34136
From: Texas!!
Joined: 04-20-2004
Member Rating: 3.4


Message 15 of 19 (120823)
07-01-2004 12:54 PM
Reply to: Message 14 by RAZD
07-01-2004 12:51 PM


Re: technology
Lost me there guy. ????????????

Aslan is not a Tame Lion

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