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04-10-2003, 18:33 | #1 |
Santa's bodyguard
Join Date: Dec 2002
Location: Home
Age: 46
Posts: 948
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Aplication of science at it's best
A novel application of speckle interferometry for the measurement of strain distributions in semi-sweet biscuits
Q Saleem1, R D Wildman1, J M Huntley1 and M B Whitworth2 1 Wolfson School of Mechanical and Manufacturing Engineering, Loughborough University, LE11 3TU, UK 2 Campden & Chorleywood Food Research Association, Chipping Campden GL55 6LD, UK Received 28 April 2003, in final form 29 July 2003, accepted for publication 29 August 2003 Published 2 October 2003 Abstract. The spontaneous formation of cracks in biscuits following baking, also known as checking, is an issue that manufacturers would like to be able to predict and avoid. Unfortunately the mechanisms driving this phenomenon are not well understood. Speckle interferometry was used to study moisture-induced in-plane strain development in biscuits. This sensitive and non-contacting technique for measuring surface displacements has two major advantages over more commonly used methods; firstly, strains can be detected at a far higher sensitivity (down to 2 Ч 10-6) than previously accessible and secondly the method is a whole-field technique, enabling observation of the development of strain distributions during moisture migration. For biscuits exposed to step changes in humidity, initial strain rates of up to 10-5 min-1 were measured, which decreased as the moisture content approached equilibrium, leading to an accumulated strain of ~10-2 after 48 h. Under these conditions, a homogeneous, uniform strain distribution was observed. The data were used to calculate the hygroscopic expansion coefficient, which was linearly related to moisture content and provides the necessary constitutive link between strain and biscuit moisture content needed to model biscuit checking. http://www.iop.org/EJ/abstract/-feat...0233/14/12/001 Now you know why cookies crumble |
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Ho, ho, ho. Santa is in town. And he has a list of naughty girls. Proud "no club member" club member Life sucks so why don't you just drop your pants and enjoy it? Tatysite, love or leave it. And don't bother complaining, thread will be closed. |
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05-10-2003, 02:09 | #2 |
Участник
Join Date: Apr 2003
Posts: 1,662
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pffftt...who didnt know that?
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05-10-2003, 02:34 | #3 |
My Waking Hour
Join Date: Feb 2003
Location: in oblivion
Gender: Male
Posts: 5,486
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it's not why they crumble it's the way they crumble...
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05-10-2003, 02:36 | #4 |
Quality Control
Join Date: Jan 2003
Age: 38
Gender: Male
Posts: 3,875
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Oooh the knowledge you acquire on a forum dedicated to two lesbian lovers..
....just mind boggling |
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05-10-2003, 03:08 | #5 |
the unattainable kish
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The problems facing cookies these days!
Its such a dirty business....to think i never appreciated it before! Informative nonetheless! |
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Ze origional p.I.m.p karens quote of the day: 'If i were gay it'd be so much easier' forkMeRaw | TatySite.net t.E.A.m. [ urmamawantsme@hotmail.com ] |
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