Great description! could it be applyed to photoinitiator mechanism? Would be interesting imagine other things
DCG Hardening (Dinesh)
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Michael Harrison
DCG Hardening (Dinesh)
http://www.dragonseye.com/Holography/grains.pdf
I didn't have time to do more than make it available as I'm stuck at work. sigh
I didn't have time to do more than make it available as I'm stuck at work. sigh
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Tom B.
DCG Hardening (Dinesh)
In the first paragraph of this treatise, I found the use of "low sensitivity" referring to Silver Halide to be a bit jarring. I believe that "high sensitivity" is more commonly used to refer to materials that are highly sensitive. Also, the possessive of "it" is not apostrophized while the contraction "it is" is. e.g. "It's unfortunate that the lion escaped its cage."
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Michael Harrison
DCG Hardening (Dinesh)
You're most welcome.
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If someone says it can't be done but they haven't tried it, don't believe them.
http://www.dragonseye.com/Holography
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If someone says it can't be done but they haven't tried it, don't believe them.
http://www.dragonseye.com/Holography
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Dinesh
DCG Hardening (Dinesh)
"Also, the possessive of "it" is not apostrophized while the contraction "it is" is. e.g. "It's unfortunate that the lion escaped its cage." "
Or, "It's unfortunate that I didn't check for typos" (and I had the kind of English Master who'd rap you over the knuckles if you confused "disinterested" for "uninterested"!).
The sensitivity thing has always got me confused. As I've mentioned before, I've seen "low sensitivity" used to mean "low exposure requirements" (as I've used it) and I've seen it in the sense you state, ie "high exposure requirements". If material A had a sensitivity (ie exposure requirement) of 8 uJ/sq cm and material B had one of 25 uJ/sq cm I tend to say that A has a lower sensitivity, although you could also say that A was more sensitive to actinic reactions, ie required a lower light threshold to carry out its physical change. I think there are two meanings of the word that are generally confused - "sensitivity" as a synonym for "exposure" and "sensitivity" as a tendency to change it's physical state on a particular input so that "high sensitivity" now means that a higher input causes a greater change.
Or, "It's unfortunate that I didn't check for typos" (and I had the kind of English Master who'd rap you over the knuckles if you confused "disinterested" for "uninterested"!).
The sensitivity thing has always got me confused. As I've mentioned before, I've seen "low sensitivity" used to mean "low exposure requirements" (as I've used it) and I've seen it in the sense you state, ie "high exposure requirements". If material A had a sensitivity (ie exposure requirement) of 8 uJ/sq cm and material B had one of 25 uJ/sq cm I tend to say that A has a lower sensitivity, although you could also say that A was more sensitive to actinic reactions, ie required a lower light threshold to carry out its physical change. I think there are two meanings of the word that are generally confused - "sensitivity" as a synonym for "exposure" and "sensitivity" as a tendency to change it's physical state on a particular input so that "high sensitivity" now means that a higher input causes a greater change.
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Dinesh
DCG Hardening (Dinesh)
"So, why don't we want to increase the PH of the fixer even more? What are the consequences? (fixer for DCG)"
You don't want to make it too hard. The initial density difference caused by the exposure is pretty low, about 1/1000 I think, without looking it up. This is the latent image To make it less "latent" and more "image" you need to amplify the latent image properties, in this case the density difference. To do this, you first immerse in water to swell the plate, which magnifies the density difference because the "softer" parts of the latent image are more affected by the water than the "harder" parts. Then you slowly draw the water out which either causes cracks to appear at the boundaries or causes voids to appear in the more dense parts, choose your favourite mechanism. As Martin stated, very little work has been done on DCG at this molecular level.
You don't want to make it too hard. The initial density difference caused by the exposure is pretty low, about 1/1000 I think, without looking it up. This is the latent image To make it less "latent" and more "image" you need to amplify the latent image properties, in this case the density difference. To do this, you first immerse in water to swell the plate, which magnifies the density difference because the "softer" parts of the latent image are more affected by the water than the "harder" parts. Then you slowly draw the water out which either causes cracks to appear at the boundaries or causes voids to appear in the more dense parts, choose your favourite mechanism. As Martin stated, very little work has been done on DCG at this molecular level.
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Dinesh
DCG Hardening (Dinesh)
"could it be applyed to photoinitiator mechanism?"
What I forgot to mention is that this room is very high. At the top of the room are large windows. Sometimes, mysterious hard balls shoot into the room from outside. These stick people don't know where these hard balls come from, but it causes chaos! Anyway, if these balls are hard enough, they break the sticks just like the karate experts. These broken sticks cause more "people linkage" but also, because of the chaos, the people are more active and bump into each other more. If these balls are too hard, they destroy the stick people and if they're not hard enough, nothing happens. However, once in a while balls shoot in from windows at both ends of the room at the same time. In this case, sometimes the same stick is struck with two balls simultaneously. These "double hits" seem to occur in particular rows of stick people, but no one knows why these rows and not at random. Some stick people use mysterious words like "constructive interference" or "phase difference" but most of the stick people don't know what that means and think these people muttering strange words are nuts.
What I forgot to mention is that this room is very high. At the top of the room are large windows. Sometimes, mysterious hard balls shoot into the room from outside. These stick people don't know where these hard balls come from, but it causes chaos! Anyway, if these balls are hard enough, they break the sticks just like the karate experts. These broken sticks cause more "people linkage" but also, because of the chaos, the people are more active and bump into each other more. If these balls are too hard, they destroy the stick people and if they're not hard enough, nothing happens. However, once in a while balls shoot in from windows at both ends of the room at the same time. In this case, sometimes the same stick is struck with two balls simultaneously. These "double hits" seem to occur in particular rows of stick people, but no one knows why these rows and not at random. Some stick people use mysterious words like "constructive interference" or "phase difference" but most of the stick people don't know what that means and think these people muttering strange words are nuts.
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Tom B.
DCG Hardening (Dinesh)
I think that if you put the proposition "Nitroglycerin has very high sensitivity to shock and vibration" that most would agree that it's best handled carefully, being highly sensitive to small vibrations. You could also say that it has a very low tolerance for being casually tossed around. And you would also be correct and in accord with common usage. To me, and perhaps 99.99% of the population, high sensitivity means more susceptibility to small variations of some quantity. Any other usage is just plain wrong, whatever the foul source it emanated from.
I hope you are not too highly sensitive to these minor criticisms of your obtuse, wrong-headed abuse of our common language, but sensitive enough to mend your evil ways (RAP!)
I hope you are not too highly sensitive to these minor criticisms of your obtuse, wrong-headed abuse of our common language, but sensitive enough to mend your evil ways (RAP!)
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Dinesh
DCG Hardening (Dinesh)
"I hope you are not too highly sensitive to these minor criticisms of your obtuse, wrong-headed abuse of our common language, but sensitive enough to mend your evil ways (RAP!)"
OUCH! If I can call on Michael's patience, I'll attempt correction.
By the way, shouldn't that be "incorrect use of our common language" or "wrong-minded abuse" since wrong implies sentience and so an object, like a head, cannot be wrong? Not that I'm highly (or lowly?) sensitive about it!
OUCH! If I can call on Michael's patience, I'll attempt correction.
By the way, shouldn't that be "incorrect use of our common language" or "wrong-minded abuse" since wrong implies sentience and so an object, like a head, cannot be wrong? Not that I'm highly (or lowly?) sensitive about it!