Comments for Sometimes I listen to myself http://blog.charleskiyanda.com Open Source Culture and Science Tue, 23 Nov 2010 04:33:10 +0000 hourly 1 http://wordpress.org/?v=3.0.1 Comment on Some cool stuff! Kaye effect and shear thinning in shampoo by Myles Alcocer http://blog.charleskiyanda.com/2007/08/09/some-cool-stuff-kaye-effect-and-shear-thinning-in-shampoo/comment-page-1/#comment-8525 Myles Alcocer Tue, 23 Nov 2010 04:33:10 +0000 http://blog.charleskiyanda.com/2007/08/09/some-cool-stuff-kaye-effect-and-shear-thinning-in-shampoo/#comment-8525 I was seriously savoring your own blog. My partner and i will certainly make certain I pass it on to my own good friends to learn. Keep up the wonderful work! I was seriously savoring your own blog. My partner and i will certainly make certain I pass it on to my own good friends to learn. Keep up the wonderful work!

]]> Comment on classifying papers by Charles Kiyanda http://blog.charleskiyanda.com/2010/11/17/classifying-papers/comment-page-1/#comment-8477 Charles Kiyanda Thu, 18 Nov 2010 05:08:05 +0000 http://blog.charleskiyanda.com/?p=140#comment-8477 Sebastian: You're right. I looked at zotero a while back and I remember looking at a video which made a big deal about the syncing ability. I must have been mistaken as the zotero website is pretty clear now that you can work entirely locally. Thanks for the comment. Sebastian:
You’re right. I looked at zotero a while back and I remember looking at a video which made a big deal about the syncing ability. I must have been mistaken as the zotero website is pretty clear now that you can work entirely locally.

Thanks for the comment.

]]> Comment on classifying papers by Sebastian http://blog.charleskiyanda.com/2010/11/17/classifying-papers/comment-page-1/#comment-8472 Sebastian Wed, 17 Nov 2010 10:52:41 +0000 http://blog.charleskiyanda.com/?p=140#comment-8472 you're mistaken about Zotero. By default, Zotero stores all of your data locally (the default is in your FF profile, but that can easily be changed to any location on your harddisk). Except for features like data sharing etc. that by definition require an online component, you do not need to store your data on any Zotero or other server. You do not even need a Zotero account to have access to all of its functionality (except, again, any features that by definition rely on data exchange). you’re mistaken about Zotero. By default, Zotero stores all of your data locally (the default is in your FF profile, but that can easily be changed to any location on your harddisk).

Except for features like data sharing etc. that by definition require an online component, you do not need to store your data on any Zotero or other server.

You do not even need a Zotero account to have access to all of its functionality (except, again, any features that by definition rely on data exchange).

]]> Comment on Six months music challenge, part 8: Undercover black man by Undercover Black Man http://blog.charleskiyanda.com/2008/10/28/six-months-music-challenge-part-8-undercover-black-man/comment-page-1/#comment-1252 Undercover Black Man Wed, 29 Oct 2008 17:34:15 +0000 http://blog.charleskiyanda.com/?p=53#comment-1252 Thanks for the linkage, Charles. As for our divergent tastes in music... I bet you'll like <a href="http://undercoverblackman.blogspot.com/2008/10/bonus-freebie-aterciopelados.html" rel="nofollow">this one</a>. Thanks for the linkage, Charles.

As for our divergent tastes in music… I bet you’ll like this one.

]]> Comment on This should be in the shameless self-promotion category by Jenny http://blog.charleskiyanda.com/2008/06/01/this-should-be-in-the-shameless-self-promotion-category/comment-page-1/#comment-503 Jenny Sun, 01 Jun 2008 14:53:10 +0000 http://blog.charleskiyanda.com/?p=43#comment-503 I voted for you!!! I voted for you!!!

]]> Comment on Going Down Hard: A Bicycle Helmet’s Perspective by Charles Kiyanda http://blog.charleskiyanda.com/2008/05/08/going-down-hard-a-bicycle-helmets-perspective/comment-page-1/#comment-464 Charles Kiyanda Fri, 09 May 2008 16:29:29 +0000 http://blog.charleskiyanda.com/?p=38#comment-464 Richard, I just saw the second document is 173 pages, so it might end up being tomorrow. :) Just before I keep going in this discussion, let me point out that I've seen your site (I had been there and read a lot of the material some time ago as well). I agree with you that there are other factors that play an even bigger role than helmet in bicycle safety. Learning how to ride a bicycle safely probably leads in a greater reduction of cycling injuries than simply wearing a helmet. I'm a strong advocate of teaching kids how to ride a bicycle safely. I would also advocate teaching safe riding practices to children in a formal teaching environment (i.e. not at home, but in a place which makes the child conscious that this is something important to remember). Safe riding practices are number 1. We agree on this. The questions I'm posing here are: 1-Can modern bycicle helmet actually help your head in a crash and to what point? 2-Are typical crash conditions which involve your head within the design bounds of bicycle helmets or do they occur at a point where it would make no difference? Just trying to clarify the scope of what I'm discussing here. It also seems like the documents you suggested in your comment deal with that point. Richard,
I just saw the second document is 173 pages, so it might end up being tomorrow. :)
Just before I keep going in this discussion, let me point out that I’ve seen your site (I had been there and read a lot of the material some time ago as well). I agree with you that there are other factors that play an even bigger role than helmet in bicycle safety. Learning how to ride a bicycle safely probably leads in a greater reduction of cycling injuries than simply wearing a helmet. I’m a strong advocate of teaching kids how to ride a bicycle safely. I would also advocate teaching safe riding practices to children in a formal teaching environment (i.e. not at home, but in a place which makes the child conscious that this is something important to remember). Safe riding practices are number 1. We agree on this.

The questions I’m posing here are:
1-Can modern bycicle helmet actually help your head in a crash and to what point?
2-Are typical crash conditions which involve your head within the design bounds of bicycle helmets or do they occur at a point where it would make no difference?

Just trying to clarify the scope of what I’m discussing here. It also seems like the documents you suggested in your comment deal with that point.

]]> Comment on Going Down Hard: A Bicycle Helmet’s Perspective by Charles Kiyanda http://blog.charleskiyanda.com/2008/05/08/going-down-hard-a-bicycle-helmets-perspective/comment-page-1/#comment-463 Charles Kiyanda Fri, 09 May 2008 16:14:06 +0000 http://blog.charleskiyanda.com/?p=38#comment-463 Richard, thank you for leaving this comment. I've just finished reading the first document at: http://www.cpsc.gov/LIBRARY/FOIA/FOIA98/PUBCOM/34C7A89B.PDF Basically, engineer Sundahi argues against the use of a heavier test mass (5kg was proposed for the standard instead of about 3kg) for infant helmets. The justification is that helmets need to decelerate the head at impact respecting a certain maximum acceleration. To do so, the helmet crushes. (Sundahi says that energy absorption is not the critical factor, but acceleration/time is the critical parameter to watch. While it may be through, most materials used to decelerate impacts do so via crushing which absorbs impact energy, so really the helmet does both, it decelarates the head and absorbs energy as crushed materials don't tend to rebound very hard, but nonetheless, that's not the point.) The analysis engineer Sundahi goes through shows that a helmet designed with a 5kg test mass would end up being stiffer (the liner material is made more dense) and a lighter head would not allow the liner to crush, but really just to rebound. So the helmet would decelarate the head, but make it reaccelarate the other way. The analysis also shows such a helmet in such a condition would also produce more acceleration than it was designed for. It's quite interesting, but this letter doesn't tell me whether this has caused actual head trauma in children wearing helmets designed for heavier heads. Also, this document is from 1998. I haven't looked but is the standard still at 5kg for infant head proxy? I'm not saying the Sundahi letter is useless, I'm just wondering if there's more information on this particular issue. From the analysis in there, it sounds like something to be investigated further. Could it be that in the end, maximum acceleration isn't the critical factor in head damage in children? This is an interesting discussion (and I think an important one). I haven't read the second document you sent, but let me do so today and comment back here. Richard, thank you for leaving this comment. I’ve just finished reading the first document at:

http://www.cpsc.gov/LIBRARY/FOIA/FOIA98/PUBCOM/34C7A89B.PDF

Basically, engineer Sundahi argues against the use of a heavier test mass (5kg was proposed for the standard instead of about 3kg) for infant helmets. The justification is that helmets need to decelerate the head at impact respecting a certain maximum acceleration. To do so, the helmet crushes. (Sundahi says that energy absorption is not the critical factor, but acceleration/time is the critical parameter to watch. While it may be through, most materials used to decelerate impacts do so via crushing which absorbs impact energy, so really the helmet does both, it decelarates the head and absorbs energy as crushed materials don’t tend to rebound very hard, but nonetheless, that’s not the point.) The analysis engineer Sundahi goes through shows that a helmet designed with a 5kg test mass would end up being stiffer (the liner material is made more dense) and a lighter head would not allow the liner to crush, but really just to rebound. So the helmet would decelarate the head, but make it reaccelarate the other way. The analysis also shows such a helmet in such a condition would also produce more acceleration than it was designed for.

It’s quite interesting, but this letter doesn’t tell me whether this has caused actual head trauma in children wearing helmets designed for heavier heads. Also, this document is from 1998. I haven’t looked but is the standard still at 5kg for infant head proxy?

I’m not saying the Sundahi letter is useless, I’m just wondering if there’s more information on this particular issue. From the analysis in there, it sounds like something to be investigated further. Could it be that in the end, maximum acceleration isn’t the critical factor in head damage in children? This is an interesting discussion (and I think an important one).

I haven’t read the second document you sent, but let me do so today and comment back here.

]]> Comment on Going Down Hard: A Bicycle Helmet’s Perspective by Richard Keatinge http://blog.charleskiyanda.com/2008/05/08/going-down-hard-a-bicycle-helmets-perspective/comment-page-1/#comment-462 Richard Keatinge Fri, 09 May 2008 11:18:40 +0000 http://blog.charleskiyanda.com/?p=38#comment-462 The main problem is that in real accidents helmets don't seem to work as designed at any speed. See the senior engineer of Bell at http://www.cpsc.gov/LIBRARY/FOIA/FOIA98/PUBCOM/34C7A89B.PDF and the Australian Federal Bureau of Transport at http://www.atsb.gov.au/publications/1987/Mcycle_Helm_1.aspx The main problem is that in real accidents helmets don’t seem to work as designed at any speed. See the senior engineer of Bell at
http://www.cpsc.gov/LIBRARY/FOIA/FOIA98/PUBCOM/34C7A89B.PDF
and the Australian Federal Bureau of Transport at
http://www.atsb.gov.au/publications/1987/Mcycle_Helm_1.aspx

]]> Comment on Lenswork goes green by Matt Hanson http://blog.charleskiyanda.com/2008/03/15/lenswork-goes-green/comment-page-1/#comment-287 Matt Hanson Sat, 15 Mar 2008 09:00:05 +0000 http://blog.charleskiyanda.com/2008/03/15/lenswork-goes-green/#comment-287 Good writing. Keep up the good work. I just added your RSS feed my Google News Reader.. Matt Hanson Good writing. Keep up the good work. I just added your RSS feed my Google News Reader..

Matt Hanson

]]> Comment on Physics is fun by Bogusia Gierus http://blog.charleskiyanda.com/2007/12/07/physics-is-fun/comment-page-1/#comment-59 Bogusia Gierus Thu, 20 Dec 2007 02:04:49 +0000 http://blog.charleskiyanda.com/2007/12/07/physics-is-fun/#comment-59 J showed me the one you're talking about in this post. It's kind of like "The Incredible Machine". I really like onlike puzzles. A recent one that I found and really enjoyed was a Toyota IQ challenge. Kind of funny that Toyota created a puzzle, but it has nothing to do with Toyota, but the puzzle is actually quite simple and fun. Try to unlock the cube: http://www.toyota-europe.com/innovation/design/concept_cars/intelligence/en/index.aspx J showed me the one you’re talking about in this post. It’s kind of like “The Incredible Machine”.

I really like onlike puzzles. A recent one that I found and really enjoyed was a Toyota IQ challenge. Kind of funny that Toyota created a puzzle, but it has nothing to do with Toyota, but the puzzle is actually quite simple and fun. Try to unlock the cube:

http://www.toyota-europe.com/innovation/design/concept_cars/intelligence/en/index.aspx

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