|
Job Discussion Forums "The Internet's Meeting Place for ESL/EFL Students and Teachers from Around the World!"
|
View previous topic :: View next topic |
Author |
Message |
Baba Alex

Joined: 17 Aug 2004 Posts: 2411
|
Posted: Thu Jul 19, 2007 8:15 am Post subject: Canadian TEFL teachers in Turkey experience a 'sticky' time |
|
|
Quote: |
The remarkable adhesive abilities of geckos and mussels have been combined to create a super-sticky material.
Unlike other adhesives inspired by the nimble reptiles, "geckel" can attach to both wet and dry surfaces, the team that developed the material says.
Its staying power comes from coating fibrous silicone, similar in structure to a gecko's foot, with a polymer that mimics the "glue" used by mussels.
Writing in Nature, the researchers say it could have medical applications.
"I envision that adhesive tapes made out of geckel could be used to replace sutures for wound closure, and may also be useful as a water-resistant adhesive for bandages and drug-delivery patches," said Professor Phillip Messersmith from Northwestern University in Chicago.
"Such a bandage would remain firmly attached to the skin during bathing but would permit easy removal upon healing."
Other research teams claim they have already produced a gecko-inspired material that works underwater.
Tiny forces
Geckos have an incredible ability to stick to surfaces. Some studies suggest the over-engineered reptiles can hold hundreds of times their own body weight.
Geckos can support hundreds of times their own body weight
In 2000, a University of California team showed that the adhesion was due to very weak intermolecular forces produced by the billions of hair-like structures, known as setae, on each gecko foot.
These "van der Waals" forces arise when unbalanced electrical charges around molecules attract one another.
The cumulative attractive force of billions of setae allows geckos to scurry up walls and even hang upside down on polished glass.
The reptile's grip is only released when it peels its foot off the surface.
The new geckel material exploits this ability but also combines it with the sticking power of mussels.
It consists of a base of densely packed silicone setae coated with a polymer that mimics amino acids found in the "glues" of mussels.
"I was reading a research paper about the drop of adhesion in geckos when [they go] under water, and it hit me: maybe we could apply what we know about mussels to make gecko adhesion work under water," said Professor Messersmith
Tests showed that the material could be stuck and unstuck more than 1,000 times, even when used under water. The researchers said that other materials had only demonstrated "a few contact cycles".
Removing the polymer coating drastically reduced its efficiency.
Sticky tape
Creating a cheap, mass produced adhesive that mimics the sticking power of the cold-blooded gecko has long been a goal of scientists.
In 2003, a team from the University of Manchester produced small quantities of a sticky gecko tape.
Setae allow geckos to scurry up walls and hang upside down
It was produced using electron-beam lithography, where a beam of electrons etches patterns in a surface.
The same technique is used to make geckel but is expensive and difficult to scale-up for mass production.
For example, the pieces of geckel used in the latest experiments were just 60 nanometres (billionths of a metre) in diameter.
"We have demonstrated a proof of concept," said Professor Messersmith.
"The challenge will be to scale up the technology and still have the geckel material exhibit adhesive behaviour."
But last year, researchers at aerospace and defence firm BAE Systems raised hopes of mass production when they showed off centimetre length strips of a plastic, known as Synthetic Gecko.
Sticking plaster
Using a technique known as photo-lithography, common in the silicon industry, they have since been able to scale up production.
"We've now got large pieces," said Dr Sajad Haq, a research scientist at the company's Advanced Technology Centre in Bristol.
Synthetic Gecko is composed of millions of mushroom-shaped hairs
He was unable to reveal the exact size of the sheets as the company has applied for patents on the material.
He also said that they have optimised the design of the nylon-like material, which is covered with millions of tiny mushroom-like hairs.
"We've now got the material working on rough surfaces and wet surfaces, so it does work underwater for example" he said.
Crucially, he said, his team has not had to tweak the design too much to make it work when wet.
"The material we use is still a simple system," he said. "We haven't had to do anything complex to ensure it works underwater."
He also said that, like geckel, Synthetic Gecko could be re-used over and over again.
Once patented, the firm plans to use the material for a range of applications from repair patches for tanks, aircraft and submarines to crawler robots.
"It's becoming more and more practical," he said. "It's getting very close to a high maturity level."
As the Synthetic Gecko research is commercially sensitive, specific details have not yet been published. |
http://news.bbc.co.uk/2/hi/science/nature/6904175.stm |
|
Back to top |
|
 |
yaramaz

Joined: 05 Mar 2003 Posts: 2384 Location: Not where I was before
|
Posted: Thu Jul 19, 2007 9:25 am Post subject: |
|
|
It's even worse because the Canadian teachers are so morbidly obese too. |
|
Back to top |
|
 |
Baba Alex

Joined: 17 Aug 2004 Posts: 2411
|
Posted: Thu Jul 19, 2007 9:37 am Post subject: |
|
|
yaramaz wrote: |
It's even worse because the Canadian teachers are so morbidly obese too. |
Have you tried the heroin diet? |
|
Back to top |
|
 |
yaramaz

Joined: 05 Mar 2003 Posts: 2384 Location: Not where I was before
|
Posted: Thu Jul 19, 2007 6:21 pm Post subject: |
|
|
I did once, but the needle stuck to my hand and then my hand got stuck to a pole and I stayed stuck to the pole for a week and got really bored and couldn't be bothered to try it again. I'm still there, if you want to buy me a beer- both hands are now stuck so you'll have to provide a tall table and a straw. It's rough being a sticky, morbidly obese Canadian these days. |
|
Back to top |
|
 |
justme

Joined: 18 May 2004 Posts: 1944 Location: Istanbul
|
Posted: Thu Jul 19, 2007 6:35 pm Post subject: |
|
|
Um, got a match? |
|
Back to top |
|
 |
yaramaz

Joined: 05 Mar 2003 Posts: 2384 Location: Not where I was before
|
Posted: Thu Jul 19, 2007 6:45 pm Post subject: |
|
|
I do, actually, but can't reach it. Back pocket, by the can opener and spare syringe.
Found Jesus lately, Justme? |
|
Back to top |
|
 |
Golightly

Joined: 08 Feb 2005 Posts: 877 Location: in the bar, next to the raki
|
Posted: Thu Jul 19, 2007 8:48 pm Post subject: |
|
|
I've found Jesus.
He was down the back of the sofa, covered in fluff and boiled sweets. |
|
Back to top |
|
 |
dmb

Joined: 12 Feb 2003 Posts: 8397
|
Posted: Thu Jul 19, 2007 10:20 pm Post subject: |
|
|
Golightly wrote: |
I've found Jesus.
He was down the back of the sofa, covered in fluff and boiled sweets. |
Hmmm fluff and boiled sweets.
Speaking of obese Canadians. I was going to answer on the other thread but it got locked. I am in Toronto as I write. Walking around the streets here I can't help notice the obesity. I am not surprised though. The size of portions here is just ridiculous. I keep asking for kids portions and I still can't finish them! |
|
Back to top |
|
 |
phoebe caulfield
Joined: 25 Jun 2007 Posts: 31 Location: Bilkent, Ankara
|
Posted: Fri Jul 20, 2007 2:47 am Post subject: |
|
|
Who says that you have to finish your portions? Toronto portions are great! Try eating in Texas... |
|
Back to top |
|
 |
yaramaz

Joined: 05 Mar 2003 Posts: 2384 Location: Not where I was before
|
Posted: Fri Jul 20, 2007 4:29 am Post subject: |
|
|
Back when I was a Canadian who actually lived in Canada (very very long ago), I used to just eat half and take the rest home for breakfast. It made for some most excellent breakfasts- I still love waking up to breakfasts of reheaed enchiladas or spicy tofu with ginger bok choy or red Thai chicken curries... so much more interesting than cornflakes.
On a similar note, my mother loves coming to see me here in Turkey because we can eat out without feeling stuffed and gross afterwards. The portion sizes are just right for her. Small but perfectly formed. |
|
Back to top |
|
 |
Baba Alex

Joined: 17 Aug 2004 Posts: 2411
|
Posted: Fri Jul 20, 2007 6:35 am Post subject: |
|
|
yaramaz wrote: |
Back when I was a Canadian who actually lived in Canada (very very long ago), I used to just eat half and take the rest home for breakfast. It made for some most excellent breakfasts- I still love waking up to breakfasts of reheaed enchiladas or spicy tofu with ginger bok choy or red Thai chicken curries... so much more interesting than cornflakes.
On a similar note, my mother loves coming to see me here in Turkey because we can eat out without feeling stuffed and gross afterwards. The portion sizes are just right for her. Small but perfectly formed. |
Last night's curry is certainly in top five of best breakfasts ever.
5. Pizza + Tea (The new trend of simit houses selling pizza in the morning is surely a message that God is alive and he loves us)
4. Feta Cheese soaked in olive oil, fresh crusty bread, cucumbers and G+T (a Jimmycim special devised by my father when we spent a week down in Antalya two summers ago)
3. English Breakfast + Speckled Hen/London Pride/Cains (depending on where you are in the country)
2. Left over curry + whatever booze is left from the night before (at university, invariably it would be port)
1. Kokorec and Efes at Mecan's in Kadikoy (pure heaven and the only sensible way to deal with an Efes hangover)
*bows*� |
|
Back to top |
|
 |
justme

Joined: 18 May 2004 Posts: 1944 Location: Istanbul
|
Posted: Sun Jul 22, 2007 6:59 am Post subject: |
|
|
yaramaz wrote: |
I do, actually, but can't reach it. Back pocket, by the can opener and spare syringe.
Found Jesus lately, Justme? |
It's just that in your sticky situation I thought you maybe could use a Personal Saviour.
Jesus is everywhere, dontcha know? Maybe he's even in your back pocket! |
|
Back to top |
|
 |
ghost
Joined: 30 Jan 2003 Posts: 1693 Location: Saudi Arabia
|
Posted: Sun Jul 29, 2007 7:21 am Post subject: sugar ban |
|
|
Sugar is the real culprit for weight gain.
Just drinking a can of coke a day (which might not seem much, but is...) will add between 15-20 pounds in a year.
Personal example: Ghost used to drink a can of coke with every meal in Turkey, and the weight on the frame was around 80-83 kilos (back in 2003).
In 2005 ghost gave up coke, increased exercise to 1-2 hours a day total and went back down to a more normal weight of 72-73 kilos on the 6.2 frame.
In Korea now, the 'thinnest' country with Japan in the developed world - if you look at what Koreans eat and don't eat, we can learn some salutary lessons.
1. Koreans almost never eat dessert - if a dessert is given it will be some fruit.
2. Normal meals are taken without drinking liquids. Yes, you read it right. Koreans don't normally eat and drink at the same time - they think that is unhealthy. They will drink water after meals in small metal cups, which are ubiquitous in all the restaurants.
3. Portion size - everything is smaller in Korea. Even for those unfortunates who wish to buy a can of coke, they will be surprised to see that coke cans come in tiny size Korean sizes - about half the size of the normal coke can you see in the Western countries.
4. Korean adults don't normally eat between meals. The only exception to that is when they go to a Korean Pub, and then all kinds of salty foods are served with the drinks. And Korean men can really consume a lot of beer - but few of these Koreans have 'pot bellies' so common in the west.
5. Look at the snacks Korean adults eat in the staff room - pieces of fruit, rice cakes (which are very low in fat and sugar) and other unidentifiable foods which are healthy.
Ghost would also like to dispel the myth about carbs (carbohydrates). Koreans and Japanese get about 60-70% of their calories from rice - and white rice at that. They do not get fat. The problem is not carbs (which the body needs more than protein) but what goes with the carbs and the portions.
The 'morbidly obese Canadians' who continue to find excuses for their conditions should get off the couch, and try to copy modified versions of the Korean diet as outlined above.
Don't buy that junk food, because if is in the house, you will consume it. Humans are weak.
Ghost in Korea |
|
Back to top |
|
 |
justme

Joined: 18 May 2004 Posts: 1944 Location: Istanbul
|
Posted: Sun Jul 29, 2007 8:37 pm Post subject: |
|
|
Quote: |
and other unidentifiable foods which are healthy.
|
Wow, this sure makes me want to go on the Korean diet! The more unidentifiable, the better.
Ender gets some unidentifiable stuff in the folds of his neck. It's lint-ish, but not at all navel-y, though it's quite often blue. Sometimes it's sticky. I have no idea what it is or how it gets there. Maybe I should eat it?
BTW, cool avatar, ghost! |
|
Back to top |
|
 |
yaramaz

Joined: 05 Mar 2003 Posts: 2384 Location: Not where I was before
|
Posted: Mon Jul 30, 2007 7:10 am Post subject: |
|
|
Quote: |
The 'morbidly obese Canadians' who continue to find excuses for their conditions should get off the couch, and try to copy modified versions of the Korean diet as outlined above |
.
Hey ghost, the morbidly obese Canadians were just hypothetical. I don't actually know any fat Canadians here. Or maybe I do and they are just masquerading as slim folk.
I never drink Coke. Too sweet. Yuck. Does this mean I'll lose 20 pounds this year? I don't own a tv either so I can't sit around on my fat ass all day either. |
|
Back to top |
|
 |
|
|
You cannot post new topics in this forum You cannot reply to topics in this forum You cannot edit your posts in this forum You cannot delete your posts in this forum You cannot vote in polls in this forum
|
This page is maintained by the one and only Dave Sperling. Contact Dave's ESL Cafe
Copyright © 2018 Dave Sperling. All Rights Reserved.
Powered by phpBB © 2001, 2002 phpBB Group
|