User talk:Diamonddavej
From Wikipedia, the free encyclopedia
Contents |
[edit] Dwarves etc
Hi Diamonddave, I've just looked at David Icke and wanted to tell you how much I laughed at your story about the leader who had a small dwarf planted in his intestines by Mexico with the help of the UN. LOL. I also liked your observation that insane people are the ones without followers . . . SlimVirgin 04:36, Feb 19, 2005 (UTC)
[edit] Formal Thought Disorder
I put an NPOV tag on the page. I request you show the information. As the discussion page would show, I'm a tad not understanding of things and not particularly clear. I'm aware of this. If there is a distinct link between misdiangosed of schizophrenia (Which there is, I know a person who have been misdiagnosed and are asperger's syndrome), and it is based on formal thought disorder, by definition it belongs in the formal thought disorder page. You're clearly far better equipped to handle this than me.J. M. 07:40, 28 May 2006 (UTC)
[edit] Laser Safety
Dave,
Why are you so focused on "boiling of the vitreous" as the damage mode in the eye to receive emphasis in the introductory part of the Laser Safety article? The primary damage from visible and near IR radiation is heat burn to the retina that damages or destroys retinal nerve cells, producing a blind spot. This is clearly illustrated in the the abstract of a Nd:YAG laser injury report that you recently provided a link to. Pzavon 01:38, 28 June 2006 (UTC)
- The thermal and boiling etc. are over emphasised because I have yet improve that section by including metabolic stress effects. It may end up as a separate section. As far as I understand, intense laser light can cause non-thermal injury, in particular to cone cells (colour sensitive cells), via Phototoxicity. Intense laser light can cause cone cells to run out of oxygen, sugar, calcium or build up toxic levels of waste products (lactic acid) and die. I have university access to medical journals. I will look up Pubmed and appropriate references to make sure the info is correct. Should be done in the next 24 hours. If you know more about phototoxicity, then add the info.
- Diamond Dave 28/06/2006 14:10 UT
-
- Just read an interesting article - "Light damage to the retina occurs through three general mechanisms involving thermal, mechanical, or photochemical effects." Heating the retina by just 10 C is enough to kill photoreceptors, scary. [1] Diamond Dave 28/06/2006 14:25 UT
- I would expect that laser burns will ocure before loss of oxygen or those other metabolic effects you mention if the laser is powerful enough to be called intense. Metabolic effects will be an issue only if the beam power is low enough NOT to cause a burn. Therefore the burn is the primary effect to be concerned with.
- With regard to medical literature, make sure you are looking at reports of true studies (of which there are many), not accounts of clinical observations where there may be more speculation and less solid support for suggested causes. Pzavon 00:30, 29 June 2006 (UTC)
-
- It is correct that powerful lasers damage the retina via heating. However, heating does not seem to explain the damage caused by laser pointers. Calculations indicate that the heating of the retina should be insufficient to cause damage. Other, non-thermal mechanisms seem to be responsible, they appear to operate only if a person stares at a laser pointer beam for several seconds or more. One mechanism proposed is oxidative stress. The basic safety calculations that rely only on estimating the thermal effects on the retina, cannot properly asses risk given that there are children and even adults foolish enough to stare at a 1 to 5 mW laser. That is why the UK bans limits to <1mW, but its not enforced.
-
- Yes, I am aware of controlled studies that involve shining laser light onto the retinas of people about to have an eye removed. I will read those studies and update accordingly. Also there is the issue of more powerful green lasers coming on the market, exploiting legal loop-holes. I recently bought a Class IIIb 70mW 532 nm laser...thus my sudden interest in laser safety. Thanks for your help in improving my contribution. Diamond Dave 29/06/2006 13:10 UT
- My point with regard to proposed non-thermal injury mechanisms is that they are NOT connected to "powerful" lasers, as those are the ones that clearly cause thermal injuries. It is with exposure to the light from less powerful lasers that these mechanisms have been proposed. Pzavon 01:40, 30 June 2006 (UTC)
-
- Yes, I agree. I didn’t realise that you thought I was disagreeing with you, thus my delay in understanding your point. High power lasers cause immediate damage by thermal and perhaps also (of the laser is powerful enough) explosive effects too, whereas lower power lasers cause photochemical effect in isolation, a form of damage that takes several second to occur. That is what I wrote in the article, that’s the important thing. Perhaps it should be made more clear. Diamond Dave 30/06/2006 20:00 UT
[edit] Azeztulite
Hi. I've just categorized your article on Azeztulite. Someone has proposed to merge that article into Quartz which makes some sense but I suppose it could also live on its own. In particular it would help if you created an article on "fake minerals" and even a category if there are enough articles to warrant that. I was a bit confused by the concept since it suggests that Azeztulite is not a mineral. As I understand it, it is a mineral (since it's just quartz), albeit not a miraculous one. Cheers. Pascal.Tesson 05:52, 16 September 2006 (UTC)
[edit] License tagging for Image:Hydrothermal Breccia.jpg
Thanks for uploading Image:Hydrothermal Breccia.jpg. Wikipedia gets thousands of images uploaded every day, and in order to verify that the images can be legally used on Wikipedia, the source and copyright status must be indicated. Images need to have an image tag applied to the image description page indicating the copyright status of the image. This uniform and easy-to-understand method of indicating the license status allows potential re-users of the images to know what they are allowed to do with the images.
For more information on using images, see the following pages:
This is an automated notice by OrphanBot. If you need help on selecting a tag to use, or in adding the tag to the image description, feel free to post a message at Wikipedia:Media copyright questions. 05:07, 17 February 2007 (UTC)
